There’s not a straight up answer, it depends on how you have things set up. What I do when I get into these types of situation is backtrack a bit, get things to their default state. I would remove the lattice influence, maybe delete it and add a new shinny one, straighten the head, align those vertices, etc, just so everything is back to default. Then I start again taking one thing at a time watching that it doesn’t break again, and if it does, no I can focus on solving that sole problem, which is easer, then move on.