If you are an EU citizen you should sign the currently ongoing European Citizens Initiative on the banning of conversion therapy. If it reaches 1 million signatures and passes the threshold for signatures from 7 member countries, the EU commision will consider drafting a proposal on this matter, which is the first step to getting legislation.

Link: https://citizens-initiative.europa.eu/initiatives/details/2024/000001_en

Further details on how a European Citizens Initiative works: https://commission.europa.eu/about-european-commission/get-involved/european-citizens-initiative_en