What should a $<3000$ user do when a question is good enough to reopen.
Consider a question was bad but it get better by editing now what should a $<3000$ user do when it is good enough to reopen?
If your question got closed, the first edit will put it in the reopen queue, where users will review it and consider whether or not it should be reopened.
Note that this is a one-shot chance. After the first edit (by yourself, or someone else), the question is put in the reopen review queue, and if it does not get reopened, it will not be put there again. So make that edit count.
After that you can use the Requests for Reopen & Undeletion Votes, etc. (volume 01/2015 - ) [current version] thread, in which you can post a short request explaining why you think that the question should be reopened. You can also use the chatroom aimed for such requests, however, it's not clear how many people use that chatroom so it might not be the most effective way.
What you shouldn't do, however, is delete and repost your question; and preferably avoid adding to the question itself meta-requests for reopening. Those belong at the comments, at best. The question should be about the question (one exception is when your post is marked as a duplicate, and you wish to explain why it's not a duplicate).
If none of that worked, then you have to accept---at some point---that the community has chosen to close your question and move on. What can you do after this? I don't know.