Spare PC and an HDMI cable. That’s the only way since you purchased a semi-obsolete rig.
I have recentley picked up an LG 65LM6200 Smart Tv second Hand. Absolutley love it but can't seem to find a way to watch YouTube on it. I have tried to search for the app but can't find it and the browser doesn't support YouTube anymore. I can't mirror my phone as I have not home broadband so have to hotspot my phone to get the TV online.
Any ideas guys??