Best Streaming Settings?

Looking to get into streaming again & been messing with output/video settings -- tested going live with bandwidth mode & wasnt too happy with the results... so maybe someone could help?

Specs:

GPU= 4090

CPU= i9-14900kf

Ram= 32g DDR5 6k Mhz

So my PC is WELL EQUIPPED for probably anything.. i think my issue is my internet?
-800 download & 40 upload (with multiple users on at same time)

Any recommendations for settings? Mainly bitrate / Outoput resolution? But sending me all the encoder settings may help... thanks :D