try to use one of the burner e-mail services

Reddit changed the policy last year, officially they still tolerate alt-accounts but most subs ban or restrict showing your content unless manually approved by mods.

I handle it so that alt-accounts under specific karma level and account age are hidden and I approve posts manually. In bigger subs they just never review comments, so the chance that your comments are hidden increase. If you then continue posting things you might trigger the bot to flag your account.

This reduces 98 percent of clowns. I think most subreddits use automoderator to do similar things, otherwise moderating huge subreddits is very hard.

Reddit gave basically subreddit mods more power to handle bots, alts etc.