openpr.com
In short: openPR (openpr.com) accepts press release. It is free + paid tier to submit, takes a moderate amount of preparation, and scores 43/100 on our impact ranking (long tail).
Submit legitimate launch/news release.
Use sparingly; no spammy anchor stuffing.
Priority is later, which sets the band. It is free + paid tier and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.