Handwriting Help please

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My Yr2 DS is struggling with his writing, it's big, weirdly joint and mostly illegible 🙁
How can I help him Improve?

We practice spellings in a book like this to encourage the correct sizing of letters.
Worth looking at a pencil grip if he's not holding the pencil properly.
Us he forming his letters properly?? If not, find a handwriting book. We tend to go for more gimicy ones like this because it's all writing, and Spiderman is more attractive than most books. We have an (American??) one at the moment with a space theme.

Is he doing cursive yet?? Once we got that cracked, writing got a lot better, but we moved schools as old school was about to start, after new school had done the ground work. It was a tough few months getting that cracked.

www.cgpbooks.co.uk/Parent/whoAreYou.book_E2HW11.pageFlip_E2HW11

These go from reception to year 4. Help with formation, gradually introducing joins.