Try not to discourage people from genuine self improvement because of a belief that the primal state of a person is somehow desirable.
Try not to assume that completely unknown people know what "genuine" self improvement is.
There are plenty of qualities that are cannot be objectively defined as "good" or "bad" but might rub certain people the wrong way. For these, it's best to find a group one actually meshes with, rather than conforming.
I trust that the person who's actually wanting to improve themself knows more about themself than a stranger on the internet.
I was questioning the motivation to self-improve as opposed to the act itself.
Improving yourself because some other people have a problem with who you are isn't a good idea, as not everyone you meet is going to like you, and for an infinite number of possible reasons. Tack said they have an abrasive personality and, like you say, since I'm a stranger on the internet and thus don't know them, I couldn't possibly comment, but that doesn't need an overhaul of personality to improve.
Indeed I would suggest the fact that Tack is empathic enough to realise that
some aspects of their personaity aren't appealing to people would negate the need for that much self-improvement. Surely the goal of self-improvement is to increase your sense of self-worth, as opposed to making yourself less unappealing to others?
Also apology to Tack for discussion of them and their problem in third person. I really don't like doing that.