Should I try to raise my reputation? How should I do this? Can I remove this ban by deleting my all posts questions, etc., or should I make a new account?
When you get hit with the automatic answer block, you get linked to a page that describes how your situation and how to get out of it
Now, improve your existing answers. You have some deleted link-only answers; elaborate on them and undelete. Don't ask questions or leave comments in the answer box, such stuff gets flagged and deleted.
Do not delete your posts, it will exacerbate the situation.
Do not create a new account, it will be deleted.
In addition, please do not ask homework-like questions on this site. See How do I ask homework questions on Physics Stack Exchange? for more information.