This will sound sacrilegious, and of course the best way to watch a great film is to have the time to enjoy and savour it, lights out, no phone, like the cinema. BUT I realised I was often watching shitty TV shows because I just wanted to watch something for half an hour. But you can literally just watch half an hour of a film and then watch another half hour another time. Plus if you get sucked into the screen you only watch a 2 hour film rather than being stuck watching like 5 hours of a random show.
You’re a big kid, you can do it. If they wanted the movie to be watched in multiple sittings they would have made it multiple movies. If you can’t sit still for 1 or 2 or 3 hours than maybe Cocomelon is more your speed