and that's definitely fair!!
just trying to help you understand that within the budget range it's very difficult to find a 'fast' phone.
you can actually with a little luck pick up the 21/31 within your budget second hand but that aside,
Fortnite on that device will definitely lower the experience a bit.
it's designed for light gaming and overall day to day stuff, not high end of course
do you run it with all settings optimised to speed at all or do you have any battery saving options turned on?