I'd certainly steer clear of the 'lower end' budget cards, as said above you could end up with worse than what you have
The two linked above seem pretty good for Fortnite gaming, check out youtube for examples of how they perform . . example:
https://www.youtube.com/results?sear...0+2gb+fortnite
If anything decent is getting to be over budget, have you thought of maybe a good second hand card?