fortnite to hit 4k60 on epic settings only need 3060ti/3070/6700xt, fifa probably dont even need dedicated gpu. so that budget is a bit tight but still doable. i would have suggested going to system integrators like dreamcore or mansa as there are many builds with those cards around the 1.7-1.8 mark, but most dont offer the o11 air/d mini.
if u can find a si with ur preferred case and one of those cards at ur budget, i would say go for it. in the meantime though, diy is ur best bet. i would suggest the following from dynacore:
| i5 12400f + msi b660m-a pro wifi | 469 |
| klevv bolt x 2x 8gb 3600mhz | 85 |
| wd blue sn570 1tb | 125 |
| powercolor rx 6700 xt hellhound | 635 |
| super flower legion gx pro 650w | 105 |
| lian li o11 air mini | 145 |
total: ~$1565. still have a bit of budget to play with, so can consider o11d mini at $15 more, though keep in mind that o11d mini only takes in sfx psu, which generally cost a lot more (at least $50 extra for the cooler master v650 sfx). u can also consider the 3060ti/3070, which can leverage dlss in fortnite to guarantee at least 60 fps at 4k, though only entry level 3070s (eg asus dual/zotac twin edge @ 800) fit the budget.