I'd probably recommend https://old.reddit.com/r/FatFIRE over /r/pf as it's more likely to have people that have experienced getting a large lump sum like this.
FatFIRE is for people who want to live large off their savings (usually understood as >$100k/yr passive income, which generally requires $2.5M+ in invested assets). That doesn't seem to describe OP's position. If FIRE is an interest, then https://www.reddit.com/r/financialindependence/ is a better bet.