Hallo and welcome @Stefan_Hartmann,
You very much seem to be in a similar situation as @petitxef here
The rtl_433 protocol binary you installed on your LilyGo is a receiving only protocol, and you won’t be able to control your 433 Mhz power plugs with it.
Have a look at all the links I posted in the other thread, and dpending on you power plugs/remote being with dip switches or self leaning you might also be able to control them with an ESP32 SRX882 receiver and STX882 transmitter combo.
The other protocols do not have HA auto-discovery though, so you would have to define any HA entries manually.
Hope this helps.