If I have logged in on my current IP previously on an account that gets banned while on a proxy, is there a chance that accounts which are playing on my current IP may be banned as well? In other words, if I have played on an account legitimately on my current IP, then bot on the same account but on a proxy, could my other accounts be banned that are on my current IP?

maybe it could, but the risk for that is pretty small. has never happened to me

Well, no one can say for sure. If you avoid interactions between the accounts and don't bot them both on the same IP at the same time you should be ok from my experience..

Pretty sure if you don't bot the account you're save, never have gotten a main banned that I was playing legitly while I got probably 30-40 accounts banned that I botted on the same IP.