Wifi soultion

Any one possible now a solution, i have a xfinity router and basically want to add to the range of my wifi but only for my gaming stuff in my room but dont want it under a new network. The only way i can think now is run a line to my room (already have one so i would use existing or run another line) but do not know what device i need, another router or mesh or what.

I have 2 gig speed and i mostly get 50-200 but i occasinally get like 1000-1500 when im in front of it but see around 800-1900 on hardwire. I get around 5-100 in the room. I notice lag sometime on wifi so want a solution for my ps5, steam deck and quest 2.