the best thing you can do is link your apology and your callout in your rules, which it seems like you have, as well as do your best to change any behaviors that were actually harmful. if you're uncertain what those behaviors are / were, i'm more than happy to read over your callout and help you identify them.

after all of that is said and done, there isn't anything else you can do other than not react. personally, my recommendation is to post what anons you get with no answer (just put a period in the post if you have to) so that you have evidence they're being sent. eventually, hopefully, the other people will realize that you're improving or just get bored. but not reacting is truly the most important thing. you've done what you can. you've covered your bases. anything else just adds fuel to the fire.

you could also try and see if they're willing to talk. but typically it takes a third party to get people talking when this sort of thing happens, because people these days are so block happy and averse to actual, intellectual, challenging, and meaningful conversation. if that conversation does happen - listen. don't be defensive, own where you've hurt people, and calmly explain yourself. the only thing you can control is how you react.

and keep in mind that, if they're only talking about it privately, people you hurt are allowed to feel hurt, especially if what you did was especially harmful. anon hate and harassment are never okay, but people are allowed to be hurt by their past experiences and share that with the people they trust (or whomever they choose). it's not always good or healthy behavior, but it's not something you have control over.