Heres my situation:

3gbps fiber connection to my house, however…

I’m in a rental property, and for some reason when the fiber was previously put in, it was run to the furthest end of the house where most rooms can’t get any signal from it.

As it’s rented, I can’t get any cables run through the walls, and there isn’t gaps in the doors to be able to run cables outside the walls either.

Currently using a 500mbps TP Link powerline adapter, however i’m maxing out at 20mbps speed. Is there any way I can get faster speeds than this or am I screwed?

EDIT: Router is Wifi 6, if that helps