The best way to read...?

I can’t decide if my current way of reading is giving me the greatest value, so I think I have 3 options for moving forward :-

1. Carry on as before, reading mostly new books with the occasional repeat;

2. Alternate between new and favourite books (50/50 mix of new and great ideas);

3. Mostly re-read favourite books to deepen knowledge, with the occasional new book.

I’m thinking Option 2. What are your thoughts ?