Just keep writing
I'm currently using a lined notebook specifically for handwriting practice to try and achieve the font style I want, then once I'm happy with the style I can change to a smaller letter size.
My desired handwriting style from a text book.
Practicing each letter: capital and small letter, letter pattern and words that have that letter once or twice.
I enjoyed doing these exercises the most =)

Before and after. When I write fast and how I normally would the writing is inconsistent and harder to read. When I practice it takes longer, requires more attention but is much easier to read. Which will help with revising my class notes.