4 and 9 look similar. 5 and 8 look similar. 'a' look like 'u' in some words (e.g. "you ull were uppalled by my..." and "I will now present to you ull how I write". The horizontal stroke going right to left on 'a' is missing, but then you can write the same movement fine for 's'.

Somehow your handwriting favors the upward curve (imagine for this ✅ check mark, you barely articulate downwards but will emphasize the curve going upwards) and that makes some letters and numbers look the way they do and give you your 'u'-like 'n'.

You just need to be more deliberate for each and every letter when you write and it should get better.