Yes, they are less prevalent due to Reddit and other social media sucking up a lot of the users.
They are still around though. One Australian forum that I’ve been on for years which is still very active is Whirlpool. Started as a tech forum and expanded. It’s very useful as source of info as it’s been around over 20 years and a lot of questions have been asked and answered there.
Some forums are still reasonably active. I use Whirlpool fairly regularly. Mostly tech related, but has lots of other sections too.
https://forums.whirlpool.net.au/
If you search around you can find others.