Agreed. It's not clear if OP meant completely, or just distancing from toxic people. Toxic people, absolutely; completely, not as a general position on mental health. (There's probably a small minority of people for whom this would work, but not many.)

But in terms of eliminating toxic people, family members aren't sacred here. If you have a parent, sibling, aunt, uncle, cousin, etc. who doesn't do your mental health any favors, it's okay to cut them out of you need to. Consider it carefully, but if it needs to be done, it's okay to do it.