Presuming you are an accredited investor, have you considered https://www.angellist.com/syndicates https://www.angellist.com/syndicates ? Or are you looking for

Presuming you are an accredited investor, have you considered https://www.angellist.com/syndicates https://www.angellist.com/syndicates ? Or are you looking for even earlier investments that are in the family/friends stage?