Buy a computer monitor as big as possible (42" non ultrawide as far as I can find). Otherwise if you are in an isolated area (no wifi reachable from other houses and thus TV hotspots), then you can just get a TV and block it from the internet on your router. If you are good with electronics, you can rip out the mic and/or network card or chip.

Then get an orange pi 5 pro/plus/ultra with a rockchip RK3588/RK3588S if they are ever fucking available again, and put plasma bigscreen on it.

Or if you are more tech savvy, hook up a recycled newish Intel laptop motherboard, slap a heatsink and fan on, 3D print a chassis, get a power supply, and throw plasma big screen on it.