Harvest Moon ds : Grand Bazaar about wedding preparations ..?

Those are all the requirements so if you've done them all Sherry will accept. If she doesn't you must not be good enough friends with Felix and or Lloyd. Once you reach four hearts you will have 26,212 FP which is not enough to meet the requirement. You need almost five hearts before you have enough FP for your proposal to work. Try getting five hearts with Felix and Lloyd then propose again.