once => a couple times/twice ==> a few times/rarely/sometimes ===> quite a few times/often ====> a lot/regularly/quite often =====> a whole lot of times/quite a lot
a little bit ==> a bit ==> quite a bit
Quite a bit would be about the same as often.
I have eaten at that restaurant quite a bit. = I eat there often enough to be very familiar with it but not regularly.
Student or Learner