Is there a way I can improve how my current questions are received because no matter what I do they get received worse? They don't even tell me what needs improvement.
Don’t say things like “I know [whatever] due to deep research”. This is pretentious because it is obvious from your questions that you are not yet an experienced physicist, and saying this kind of thing shows disrespect for those who have done deep research.
Similarly, do not mention “the science channel”. We’re all for popularizing science, but you can’t really learn physics by watching TV.
Don’t say “I want as many people to explain as possible.” This comes across as pushy, and all you need is one good explanation.
Just ask your question in a simple and clear way, do not embellish your expertise, and don’t make any demands.
You asked your question about iron and star death in a reasonable way, and it did not get downvoted. However, the problem with that question is that you could have easily found the answer by an internet search for “iron star death”. Why should we answer questions that have easily-found answers?
Patience patience patience.
One easy thing to do is to search this site by keywords and by tags. In many case, less experienced users will not take sufficient care to find duplicates or near duplicates, and their questions are closed as such. Another virtue of searching the website is that it will help you broaden your understanding of the topic by reading what others have asked, and what others have answered. It will also provide examples of well received and not so well received questions on this topic, and so will help you detect common pitfalls of closed or poorly received questions, and common themes of well-received questions on the topic.
Search the web or textbook for material on this topic. By making a lot of prior research and doing a lot of preparatory reading you will not only improve your knowledge of the topic, but you will also become familiar with the terminology of the area - the technical words - and this will be a help towards writing a question that is clear and concise.
This question and its answers also contains a lot of useful tips.
All of this takes time, hence: patience patience patience.
I am not sure how this answer will be received by the community but I'd like to point out that there are many superficial things that determine how your question is received. I am not claiming that your question was well-researched enough for the community's standards. However there is a certain way of writing which gets results, which is independent of the actual research effort done by the asker.
Your question (down-voted to -3):
I found out that iron is the death element for stars, but i couldn't find why can anyone knowledgeable on stars explain why iron causes the star to die?
An edited version of the same question which I expect wouldn't be downvoted as strongly, which doesn't actually have any more research effort than the original question:
Recently I have been interested in the life cycle of stars. I read that if a star is found to contain lots of iron, this indicates it is near the end of its life. It wasn't clear to me, though, why this is the case. Does the iron cause the star to die? Or is it just the byproduct of some other process which brings a star to its death?
An incomplete list of things which have a strong effect on up/downvotes, which I consider superficial:
Using correct punctuation, grammar, spelling. There are many people who would see your uncapitalized "i" and kind-of-runon sentence style and immediately think less of you.
Consider writing your question in a more academic, rather than just everyday-language, kind of way. This correlates with the impression that you are respectable and knowledgable in your field.
Longer questions can be good. Then the people who come just to downvote based on superficial reasons sometimes don't bother to read the whole thing, and anyone who does read the whole thing has bothered enough to give you a chance and is more likely to at least help you with a comment if the question isn't well-written.
I could write more but unfortunately don't have the time right now.
Edit: To be clear, I think that questions should not be judged this way, and I do my best not to judge questions superficially. It is just my experience that many new users have their questions downvoted for superficial reasons like this and the first step to improving that is to point it out. It actually makes me frustrated that this happens, and that is one reason I have given such a long answer here.
However I do want to say: This is not an issue, necessarily, with stack exchange itself. Many people in many fields judge by appearances. In some fields less, and in some more. Academia especially can often be very unforgiving about this. I think it is a shame because the focus should be on ideas, not presentation, but this is the world we live in. Each individual can only try not to judge superficially for themselves, and this kind of thing can be improved. It also means that students who don't speak english well but are good physicists are disadvantaged even when the communication of their ideas is clear, and just the details are missing.
I think that the reason your question here on meta got many upvotes is that many question-askers have some resentment for how harshly their questions are judged, without reasons given which are clear/justified to the asker.
The up-side is: I think there are many people here who don't judge questions superficially as well, and are happy to answer any question which is clear to them. That is why your questions did get good answers in the end, despite being downvoted.