If Unreal Engine 5 is released, will I need to pay more?

I don’t represent Epic Games but I don’t see them coming out with UE5 for quite some time, and most likely the pricing model they will use has not been determined yet.

Cerdom is correct. Epic is planning to continue developing Unreal Engine 4 for a very long time. You don’t have to worry about Unreal Engine 5 any time soon.