Cheapest is just to buy a dock/usb-c to HDMI and use a long cable (either long usb-c or long HDMI) to plug into your tv.
There are wireless HDMI dongles and even USB type c ones that would let this happen wirelessly, but you'll want to check reviews and make sure the latency isn't that bad.
Alternative cheap option is to get an android based tv stream box/stick, install the steam link software, and try to stream to that.
Finally you could just get a wireless mouse or some other wireless control option for using a computer mouse wirelessly. Keyboard with a laptop touchpad, trackball mouse, etc.