The forums of old times still exist in some corners of the internet. They used to be big and there was one for pretty much every topic.
But most died over the years or got replaced by services like Facebook groups, Reddit or Discord.
Are you still using proper forums, which ones and why haven’t you made the switch to other forms of communication?
I can’t say I really use any of the older style BBS ones like phpBB but there are plenty of smaller software communities using Discourse based forums. For less active communities they are far superior to Discord due to the more asynchronous nature and gives you a lot more control than Reddit/Lemmy.