Focus group platforms

I've been doing just studies/surveys sites like Prolific/Cloud. Looking to expand into longer 'projects' and don't mind being on camera. So turning to focus group stuff. Do I have it right...Usertesting, Dscout, and Intellizoom as the primaries? Any else? Or any other 'better' ones than one of those 3? I'm guessing capping myself at 3 will be more than enough work