[ink_13]

It just takes dedicated and deliberate practise. There's no secret method I'm afraid. Oh, except for "go slow".

[Enginerrrd]

One tip is that you need to train your eye as much as you train your hand.

First redo your grip, it probably sucks.

Then relearn the alphabet using that grip to the standard of your eye.

Then relearn to see the flaws in your handwriting in increasingly subtle ways and keep training to eliminate those flaws up to the standard of your eye.