Is there a way to get multiple image platforms (Pinterest & Cosmos) into one place?

Since Pinterest has been a disaster for me for a long while, I have now decided to keep everything locally through EagleCool software.

Wondering whether there’s a way to have multiple sites/ platforms like Pinterest into a feed and to see all images in there. I have tried through RSS (Reeder, Reeder+ and InoReader) but that did not work out for me.

So kind of hoping someone here has a way to recommend. Would like to get Pinterest and Cosmos into it.

Apologies if this is not the right community post, was not sure which of the tech communities I should be posting.