producthunt.com
In short: Product Hunt (producthunt.com) accepts product launch/profile. It is free to submit, takes only a few minutes, and scores 100/100 on our impact ranking (highest impact).
Launch your platform first; prepare maker comment and assets.
No upvote asks; personal accounts; schedule proper launch.
Priority is do first, which sets the band. It is free and quick to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.