For Instagram and Twitter, my rule of thumb is to prefer topical accounts to entity ones. That is, accounts that are dedicated to a single topic, no matter how narrow or large the scope, over those of people and/or companies.
Personal and business accounts, no matter how focused they are, tend to go off topic very often, and there's nothing to do about it. A designer or an art studio can still post about politics, religion, or whatever the controversy du jour is about. An account about logo design or some python framework, not so much if ever.
This allows me to have a feed whose content I sort of control. With Twitter, it gets even better with lists, so I have ones about dev stuff, others about business topics, etc. and the content there is almost on topic most of the time.
Since I started doing this, the impact of social media on my mood almost vanished, yet I'm still able to closely follow what's happening on topics I really care about.
When I want to see what's happening on the real world, I check my Facebook.
I'm sure aware of how bad these companies are with personal data. So it you think it'd be better to delete your account, then, yes, do it.