All my connected reddit accounts got banned for a ban evasion and now any new account i open also gets banned inspite of not join the same community for which i received ban and I have also deleted the accounts which got banned.
ban evasion will result in all your linked accts getting banned, i had accts banned similarly, but it was due to a temp ban, and not a ban evasion one, but when they temp ban it triggered some filter that detected the other accts that commented on previously block subs(its different because reddit was extra aggressive in banning many accounts, if you look on other sites people have been reporting being banned from multiple accts, and some did not violate any rules too.) this month they have been going hard after everyone.
it usuall works if you avoid the same communities, but if any of your new accounts accidentally comments on a banned sub your accts will get immediately flagged, especially if you are doing it from the same device, browser or isp/IP.
spamming, arguing with another user, or trying to contradict someone in a volatile sub, like politics for example will cause some users to become nosey and look at yuor acct, and check for any botting history, they usually report as well, simply because they dont like your comment. i deleted all my accts except one, i use an extension to delete all the posts.comments before deleting the account.
problematic subs, are usually the ones in the front page when you first login avoid those. politics, news, law, technology, are hot topics right now. also politics adjacent subs. also dont engage in reporting other users, just delete your comment and move on, reporting people attracts unwanted attention from the mods, and can get you banned for "report abuse".
some subs can auto-remove your comment, if you dont fit thier certain thresholds, this can label your acct as spam "hidden from you" but admins/mods will notice it.
also suggest waiting a while before making a new account or commenting, if you were freshly banned.