Nice grid size fitting

I am a designer already a year, but i'm still a beginner. I try to get inspired by others artworks like Boice. I saw his CPs and and they all fit in a nice grid sizes like 24, 48, 16... When I make my designes, they usually have some ugly values like 59, 43... I watched some Boice's designing streams and he said, that he has a lot of experience and that's how he knows that. I would like to know, how to do it like Boice, or any tips for making weird grids like 63. Thank you.

(sorry for my English, but I'm from Czechia 🇨🇿)