Talking of JoJo Rabbit and Ianucci. We saw a very strong sequence of films in succession at the cinema in early 2020, two being JoJo Rabbit and The Personal History of David Copperfield, and the third being 1917. I'm not sure if they are 'must see' films but they would all come close to to the top of my personal list of favourites.
Since then the Netflix All Quiet on the Western Front was very good, and would probably have been even better if - like 1917 - I'd seen it on the big screen.
Going back further, having proposed The Graduate and The Third Man in 'the best ending' thread, I would say that the rest of those films are pretty damn fine also.
One film that really affected me at the time was The Unbearable Feeling of Lightness - one of those cinema experiences where it felt as if the whole of the audience was left stunned into silence and immobility throughout the closing credits and unable to break the magic by getting up and walking out. I have no memory now of what it was about, except that there were plenty of naughty bits, but I haven't sought it out since in case it turns out to have been a bit crap. It also sounds very wanky to say that a film with that title is a favourite when friends are suggesting Gladiator or The Matrix, so I've kept quiet about until now.