Factory resetting phone?

I've pretty much tried most mobile game offers now so I can't complete them again as I've previously downloaded them. If I factory reset my phone and created a new swagbucks account, would I be able to complete all game offers again? Would I need a new phone number (if i delete my old account)? And also, in general, are there any reasons why I shouldn't factory reset my phone?

Sorry if I am asking any dumb questions