Need solutions in creating a wired connection.

Hello!

Pardon my lack of jargon, as I'm new to this.

I am looking to set up a wired Ethernet connection to my computer, as my wireless connection is unstable. Simple request, right? Wrong. My internet modem would be around 15-20 meters away from the master bedroom with no way of moving it closer, and I really don't want to run an Ethernet cable across my roof.

Is there anyway I can create a stable and fast network bridge where I can get a fast Ethernet connection? I've already tried a wifi extender, which has poorly impacted my speeds although it's fairly close to the modem.

If you need more information, don't be afraid to ask!

Thankyou in advance, Daniel.