@H4zy Depending on where you live you may collect them sorted by material and send them to a recycling company. In Germany / Europe there's #Recyclingfabrik who'll take PLA and PETG and give you points for sending stuff in you can use to get cheaper recycled rPLA and rPETG in return.

Unfortunately you can't send in everything, some materials or blends (like filaments with wood or carbon fiber in them) can't be recycled yet.

Alternatively use PHA, that stuff is compostable.