Similar situation. I quickly glance between Lemmy and Mastodon and only use old.reddit when I’m on my PC (just realised I hadn’t really used it since I’ve been making an effort to engage with the manga communities on lemmy) . All my friends and favourite artists seem to use Instagram so I only use it out of necessity for messaging and quick inspirations (I tried using Cara but I found the app somewhat slow and disliked that it wasn’t federated, so I could see it having a very low lifespan. I saw it as a poor move for artists to move to it solely on the promise of being “anti-AI” without any redundancies that a de-federated option would have)
interestingly explicit call out to their target demo. now i have to cringe when harder when i hear someone uses opera