As far as I know I’m one of the only users on the forum that has successfully convinced PSA to recognize new cards or change labels. I have since transitioned to only grading with CGC, but I can share my experiences from when I used to speak with PSA regularly. My last communication with them was in January 2021, but according to twitter the contact that I was frequently in contact with still works at PSA.
I have quite a few posts related to this.
Expand for a list of related posts I previously made
If you sign into PSA’s website, go to “Account” in the top right, then you should see a “Customer Request Center” section on the left. Click that and then click “PSA Research Request”. You will need to provide a description of the cards that you wish to add/edit, and also include multiple web sources. I’ve found that they do allow Bulbapedia as a source, but it is not enough. I have successfully submitted efour guides/articles in the past as a source (I happened to be the author of the guides that I submitted as proof, but they were not aware of that). I would also recommend submitting YouTube videos if there are any.
As an example, it took me 27 back and forth emails to get the prerelease cosmos aerodactyl recognized. The person that I was consistently in contact with was Beth/Elizabeth Dumas. They will reply to you asking for more information if they require it 
Good luck!