I have fooled around in Fortnite off and on for years, and I have come to the conclusion that these are the best settings for me. Your experience may be different, but here are the screenshots.
With these settings I sit around 190 to 230 FPS in Solo Ranked Zero Build.
If there are any tweaks you think I should make to reach that 240 FPS mark consistently let me know so I can try them. My specs should be in the signature.
Ryzen 7 7700X, MSI MAG X670E Tomahawk Wifi, Corsair DOMINATOR® TITANIUM RGB 2x16GB DDR5 DRAM 6000MT/s CL30, Sapphire Pulse AMD Radeon RX 7900 XTX, Corsair HX Series™ HX1000, Corsair MP600 PRO NH 4TB