I cant help you, as I'm no good at setup, but I think you will have a hard time finding anything. No one shares setups anymore...perhaps because of "e-sports"? Your best bet is to look at the Time Trial results in-game and copy some setups from there. Try a couple and see if any works for you. You can tinker with those. Also check SteelReserve's thread.
Rant warning!
Back in the day for GP3/4 and GP Legends, it seemed there were lots of sites to get shared setups, but it seems to be a secret arcane art that is no longer shared, unfortunately for us who don't have days to read racing manuals and run hundreds of test laps and pour over Motec graphs. Good luck!