[2023] Any way to copy my character over to my other pc?

Eco doesn't support Steam Cloud (which is also the reason it doesn't support Geforce NOW), as savegames are a world on a dedicated server, given it is developed for multiplayer experiences. You'd need to copy over your /Steam/steamapps/common/Eco/Eco_Data/Server folder to your other PC to have the same one there with the same worlds.