My son's writing is totally fine for his age. We are trying to teach him the many ways to improve his handwriting: Capital letters, tall/small/fall letters, full stop, spacing. And his creative writing: adjectives, conjunctions, sentence starters, etc.
We make sure to genuinely praise him every time he practises, which is every weekday. He does get fed up with our constant corrections, but he works hard (sometimes) and he has improved a lot. He says he "hates writing". He can write with tripod grip but keeps reverting back to a 4 finger grip which he says is more comfortable. I have not managed to convince him the tripod grip is better.
Sometimes when I give genuine praise for a specific letter he's written very neatly, I am shocked to hear him say that he doesn't like the way he's written it. He mainly says this in response to my praise. I will admit I'm not the most emotive person in the world, but my wife is and she also praises his writing a lot.
Sometimes he keeps repeating "My writing is bad, my writing is bad", and he feels especially bad when he looks at his classmates writing which is so astonishingly neat that it even makes us adults feel bad. I'm worried that he is going to convince himself that his writing is bad (it isn't), and that will hold him back in his development. I want him to be repeating "my writing is good, my writing is good", but I just can't imagine that happening.