My experience and $0.02:
If you use Instagram the way "normal" people do, it's a path to sadness. Selfies, one-upmanship, parties, perfect cakes, perfect gardens, exotic vacations, etc. All the badness. It's just human nature and it's what the platform has become. Bleh.
If, however, you go into Instagram and aggressively curate your feed to be hyper-specific to a (visual) niche you're interested in, it can be really, really great.
I have 3 Instagram accounts - my "main" one (in which I follow friends), and that's become a hellscape of all of the above. I just don't use it anymore.
My other 2 are hyper-specific: One follows pets (parrots, specifically), the other is all about coin collecting (@numismattack ahem shameless plug). Absolutely zero variation from those themes. And you know what? It's a really fun way to immerse yourself in those respective worlds! All interesting niche content, all the time. I suggest you (and others) give that a try.
Ps - no matter what your main feed is, stay far far away from the "Explore" tab. That is brain poison. It's like pure algorithmic dopamine generation and it's the root of all evil on that platform.