Constrain your use to your business needs. I technically am on social media but inactive (unless we count HN, not sure I do). If I'm dealing with businesses that insist on using, say, FB then I go to their FB page and that's it. I don't view other people's feeds, I rarely look at my own FB wall page.
If you're posting to drum up business, then just post to drum up business. Stay out of the personal and political stuff which is mostly just drama and noise. Interact only with reasonable responses to your own posts and note when people are just trying to stir something up or troll, ignore them.
i cannot use a facebook page as anything posted on pages requires boosting which is completely unaffordable for smaller business. in the end your content is shown to some guys in vietnam and if you try to narrow the audience facebook expands it such that the acquisition cost of a real customer becomes insanely expensive. facebook ads never worked and are a big scam.
so i need to use my personal profile to build relationships and sell. this means i get pulled into personal use of facebook which destroys my mental health.
Either you hire someone to manage your Social Media or decide specific rules of usage. Login only at work hours, for such amount of time to do X and nothing else. Try to have a blank account, empty of anything outside of work related, for example blank Facebook account which hosts the business page/group/whatever.
You can have a social media capable smartphone for $100 nowadays, so just buy another phone and SIM/contract and use the thing only for work. At 17/18/19h just turn it off and leave it in office.
If you're posting to drum up business, then just post to drum up business. Stay out of the personal and political stuff which is mostly just drama and noise. Interact only with reasonable responses to your own posts and note when people are just trying to stir something up or troll, ignore them.