PSE members have downvoted the question because they believe it needs to be improved or it violates a question-asking policy or any other community guideline (for example, spam). There is no other motive.
"I’m obviously being targeted by others which leads to downvotes which leads to not being able to ask questions."
No one is targeting you. Why would others be conspiring to prevent you from asking questions? Good questions (and answers) are crucial for the functioning of the site.
Questions are downvoted for many reasons, like being homework, a duplicate, non mainstream physics, lacking clarity etc. I don't think anyone has come across a case of someone getting downvoted due to a "coordinated effort to silence them".
This may sound like sarcasm, but it is actually what you implied in your question. Hopefully seeing it in writing will assuage your feelings about PSE community members, and that you will keep asking good questions.
"Can you fix this since this is ultimately harassment?"
It isn't, and nothing needs to be "fixed".
Please do not assume that it's personal when your post receives down votes. Every member of PSE has dealt with this at one stage or another, and while "it sucks", it is in no way an indicator that someone doesn't approve of you personally.
The way I think about it is that ultimately, there is nothing really bad/irredeemable about getting downvotes. Consider that it usually will compel you to improve your post$^1$ (which may result in upvotes$^2$) and good posts are essential for the community in general.
The mission of PSE is to provide good answers to good physics questions - from an elementary level, to postgraduate and postdoctoral levels.
$^1$ Whenever a post is edited, it is sent to the top of the queue so that users can read the edited version and perhaps remove their downvote and even upvote.
$^2$ Valuable information on how to improve your post is sometimes found in the comments below it.
