Depending on what exactly you want to do, there are several options to receive financial support.

A comprehensive overview over the financing schemes on European level is provided by the Flamish Government (accessible for all):

https://eufundingoverview.be

(Here the result for a search for funding schemes that support circularity: https://eufundingoverview.be/overview?fundings%5Bquery%5D=circular&fundings%5BhitsPerPage%5D=50)

There are furthermore offers made for specific sectors. This platform here by Creativesunite is for the Cultural and Creative Industries: https://creativesunite.eu/synm