Caching approaches for read replicas that get tons of traffic

hey every1 im tryin to optimze our read perfomance and runnin into some intresting challanges w caching for our read replicas esp when theyre gettin hammered w traffic were explorin diff ways to warm up the cache efectivly what methods have u found succesful in keepin caches fresh and relevent for busy read replicas any specific pattens or tools u swear by