I don't know how I missed your post, but I hope you do decide to hang out in the forums more!
Areas of the forum I love are:
The New Horizons section. There's often threads just discussing opinions about different things on ACNH, there's also a screenshot thread, so you can look at what people have done with their island and comment if you love it!
The Museum. People start their own threads displaying art they create, and they're so talented! There's also a Museum Shop, where some talented people offer to draw your AC rep/villagers or original characters in exchange for TBT bells (forum bells) and some for IRL currency.
Also, Nook's Cranny. If you are missing items from your catalogue or you want materials, there's always someone there selling!
If you're not sure where to start, I think a good place is to just jump into one of the discussions on the New Horizons thread, upload your own ACNH screenshots to the screenshot thread (there's also a New Leaf screenshot thread If that's what you play!) or just comment on AC designs etc. that you like!
Hope to see you around!