Meaning of “keep to sth” - Learner’s Dictionary

keep to sth

phrasal verb with keep uk us /kiːp/ verb (past tense and past participle kept)
STAY SOMEWHERE

B2 to stay in one particular area:

We kept to main roads all the way.
NOT CHANGE PLANS

B2 to do what you have promised or planned to do:

I think we should keep to our original plan.

(Definition of “keep to sth” from the Cambridge Learner’s Dictionary © Cambridge University Press)