hm, where to start. since you are talking about 2020-2021 period, maybe i can give you the most popular and well-received anime.
Kimetsu no Yaiba (Demon Slayer) - Human vs Demon that have been lingering in the human society for so long starting from isekai-ed Michael Jackson.Very great animation since they are from UFOTABLE aka unlimited budget works
Jujutsu Kaisen - Your typical shounen anime centered around shaman fighting evil spirit. Don't be fooled by a "blind" kakashi
Shingeki no Kyojin (Attack on Titan) - As the title says, you are being attacked by naked 3 meters and above titans. but they all get rekt by the shortest captain. how the table turned.
Fate/Zero, Fate/Stay Night, Fate/Stay Night Unlimited Blade works, Fate/Stay Night: Heaven's Feel trilogy (yes there are 3 parts and they are all in movie) - Basically everything about Fate/Stay franchise. they are a very good series in general about past heroes from so many multiverse summoned to your world, kill you, and die. So many good and memorable fight scenes.
and so on XD
Any new Anime (2020/2021) you can recommend?