A forum's a forum. Sometimes people respond, sometimes they don't.
And that is normal. The other types of social media are the ones that are messed up - with shoveling aggravating or misleading content into people's faces to force a reaction out of them. The forum doesn't have an algorhythm, that is tailored in such a way that people respond as much as possible to your posts, or put posts in your face that you are most likely to do something with - being positive or negative.
There are no 'likes' on a forum, and that's good. Because after all, the hunt for likes on the other platforms is nothing other than a hunt for validation and that little serotonin boost many drug users crave so much.
The gallery has a voting system, but it's very unubtrusive. There's no ranking on the amount of likes someone's pictures get.
Forums are also, strictly speaking, vintage technology. There simply are fewer people on here than on any of the other 'universal' platforms like facebook, twitter and such. So you might get less interaction overall, and more a sense of talking into the void. The era of forums having hundreds of posts a day are long gone, save for 1 of 2 true survivors like
www.circuitsonline.net (electronics) or the somethingawful.com forums (which matured really nicely, all the obnoxious edgy stuff is left in the 2000s era, and the terrible original owner sold it to a staff member about 5 years ago)
There's also no artificial, parasocial relationship, that makes you think you have an actual friendship with a streamer or youtuber, who can make it seem you actually know them - but when you have several thousand of people watching, there's no individual relationship anymore. Many platforms encourage whipping up such feelings with the audience. The absence of such can be a bit jarring, if you're not used to it.
So in the end i'd say (and of course that's easier said than done for some people, i know that) - don't worry about it. Enjoy the fact that there's still a place where the world doesn't revolve around posting something that gets the maximum number of interactions. Do not compare your interaction here, to that on other mass media platforms, who do have those self amplifying feedback systems in place.