I realise there may be a language barrier here but installing mod is really quite simple. There are videos on YT to help get you started. I f you only know how to download Steam mods then you are limited to whatever mods are on Steam which Larian has no say in. I would imagine that in the weeks and months to come Nexus will host more mods than Steam.
To start modding you will need BG3 Mod Manager (BG3MM) or you can use Vortex if you already have that. There are videos on how to install and configure BG3MM.
