Since people have been asking what to do, there're several petitions, one of the larger ones (with currently 85k+ signatures) is here:
change.org/p/stop-destroying-e…
(Please note that this is a non-binding outside petition useful to register & demonstrate public opposition, but it does not have any direct political weight as an official petition done via the EU portal... Still please sign if you can 🙏)
I still think directly contacting MEPs in your country will likely be more impactful at this stage...
Sign the Petition
Stop destroying EU micro-businesses: Immediate moratorium on cross-border EPR feesJeanette Koňarčíková (Change.org)