So you have 4 new hives that are growing and doing well so far?
Personally, I'd be happy with that until next Spring and I'd spend my time now learning about and working with those 4 hives.
Don't forget that if any or all of them come through winter really strong, you may need to split them next Spring in order to discourage their swarming. In other words, you might wind up splitting/doubling your hives next year anyway, and then you'll have your hands full!
Ask yourself how many hives you think you'd like overall.
Personally, I'd be happy with that until next Spring and I'd spend my time now learning about and working with those 4 hives.
Don't forget that if any or all of them come through winter really strong, you may need to split them next Spring in order to discourage their swarming. In other words, you might wind up splitting/doubling your hives next year anyway, and then you'll have your hands full!
Ask yourself how many hives you think you'd like overall.