What to do when you commited to a strategy but the fully walled?

I've actually had this happen to me a lot recently and am not sure how to respond. For example, I will open with something like m@arms into archers but when my m@arms get to his base he is full walled. At this point do I ditch archers and go towers? Or should I just try to go castle age? In theory I feel like archers and m@arms should beat palisade walls but even with fletching my archers can never fully kill their villagers that build behind the walls. If anyone can help me out it would be very much appreciated: )