This is a very good question. The short answer is, yes–it’s crucial to interact with not only your own audience but other music producers you don’t even know yet! But why?
Assuming you want to pursue music production beyond the initial level of just doing it purely for yourself as a trivial hobby, it’s really important to build your network of like minded people, be it other producers, label heads, fans, just generally nice people, etc. You’re definitely right that while SoundCloud is a good networking site / streaming platform hybrid, most genuine interaction between people happens elsewhere such as Discord, Facebook, etc.
So, if you haven’t already, try and seek out personalized connections with your fans and other artists; maybe send them a message or two every couple days just to check in, ask them how they’re doing, collaborate, whatever it be. Just maintain a positive mutual flow between yourself and other people and you’ll build a truly engaged audience that cares about what you do and is inclined to support you.