Just watch the entire MCU in order by release date. I’d do that. But it’s better to watch it on dvd or blu ray because spider man homecoming, far from home, and the Incredible Hulk are not on Disney+

If you want to get the full infinity saga on dvd or blu ray I heard it costs 500 dollars to get it

So maybe you should buy the DVD’s or blu ray’s of the MCU films you are missing from your collection