Heres a list of a few of the best app stores where you will not need to jailbreak your iOS device to be able to acess the apps that Apple does not allow on their app store:-
Best one https://www.tutuapp.vip it has the widest selection of Apps available.
The other good ones are:-
https://www.tweakboxapp.com
https://appvalley.vip
These have a much smaller selection of Apps.
