My point is that I just want to be able to discuss any topic with my followers without self-policing lest a bunch of anonymous accounts butts into the conversation and completely derails it.
Twitter has settings for who can reply to tweets, which are configurable per post. You can make it so that only people you follow can reply.
What you're probably looking for is closer to a closed discussion group or mailing list than "social media", which is presently universally-readable, algorithmically-targeted, feed-based, advertising-supported, and increasingly, saturated with AI slop (which itself has replace clickbait and ragebait).
Which reminds me of Kitman's Law: Pure drivel tend to drive off the TV screen ordinary drivel.
From Marvin Kitman <https://en.wikipedia.org/wiki/Marvin_Kitman#Television_criti...>
Cited in Arthur Bloch, *Murphy's Law and Other Reasons Things Go Wrong!" (1977) p. 30.
<https://www.scribd.com/document/672553711/Arthur-Bloch-Murph...>