Anyone have advice for Vodafone fibre and gaming?

Recently moved into a new house and got Vodafone Fibre with the Gigabox router.

Straight away I've had a few issues, the box was set up in the living room as the majority of devices the family uses are in that room but the WiFi signal upstairs is woefully bad that my PC can't connect to it.

I purchased a power line adapter which did allow me to connect to the box but at the cost of about 80% of the speed and ridiculous ping issues making all online games unplayable for me.

My question is if I drill some holes and wire a ethernet cable directly to my PC would I still have those issues. Anyone who has Vodafone fibre wired care to help?

Appreciate any help.