AFAIK there’s no way, and the VPNs you can get don’t block YouTube ads, even if you pay them. I also have a MacBook, so I just AirPlay to the TV (could also connect HDMI to Thunderbolt) and then do it in the browser. Of course the go-to is usually Firefox+uBlock Origin, but I use Safari+Wipr2 (not free; I paid $5 because it also works on iOS… sadly not tvOS). Apple’s been rumoured to drop a new ATV box for a couple years now. According to MacRumors, it’s been coming out next week for at least the past year. I suppose, one of these days, they’ll be right. If I didn’t already have one, I’d look into the lowest-powered Linux box I could connect to HDMI with 4K output for the TV, run Firefox+uBlock Origin on it, and get a wireless keyboard/mouse combo unit, and that would be that. Some paid streamers wouldn’t work well on it, but it would run Plex or Jellyfin just fine.