Frankly, I would suggest that you should leave those old questions alone, and move on to newer questions $-$ it won't help very much to try and fix them, and the only thing you'll achieve is to get back into a deeper examination of questions which didn't do very well.
You should certainly add links as comments under the Physics versions to any existing Astronomy threads where you've asked similar questions, which is something you should always do in any case. But I would leave it at that.
I would also counsel you not to delete the old questions, though to some extent this is up to you. For users that have come up against an automated question ban, it is a distinctly bad idea to delete previous questions, regardless of whether they're downvoted or closed, since the system interprets that as yet another sign that the question was bad, and adds another black mark to the file.
For your case, however, the restriction was a moderator-indicated suspension rather than a question ban, which puts you on the human side of the system. Which is good: we don't hold grudges. From what I can tell, so long as the content you post going forward is of reasonably high quality, your previous suspension (and the posts that led to it) have a blank slate on top of them, and you shouldn't worry too much about them.
Instead, focus on keeping your question quality up: read deeply and carefully, and do your due diligence in searching for duplicates and for obvious answers and sources of information, and incorporate those results into the formulation of your posts. One of the main problems with the questions you churned out previously was to rush through things, so: Think Before You Post. Take it slow, and work carefully on each and every question. Eventually you'll be able to bash out a question quickly, but it will take some time to get there. In the meantime, focus on asking better questions instead of asking more questions faster.