Which client are you using? I would upload the pictures to a different hosting site, you can comment in your existing posts and use that new hosting site for newer posts.

If that is somethong that you don't know, you can upload the pictires right from your devise (I use Amethyst or Nostrid and both goves you the option to load pictures roght within the app, I assume Damus on OIs does it too)

Y uploaded this two pictures right from my nostr client. They use "i . imgur . com" as hosting