My favorite top 20 anime of all time:-
1) Attack on Titan
2) JoJo’s Bizarre Adventure
3) Hunter x Hunter
4) Bleach
5) Death Note
6) Hellsing Ultimate
7) Berserk (1997)
8) Dororo
9) Shiki
10) Fullmetal Alchemist (Brotherhood)
11) About the Movement of the Earth
12) One Punch Man
13) Naruto
14) Gintama
15) The Case Study of Vanitas
16) Monster
17) Fate/Zero
18) One piece
19) Drifters
20) The Eminence in Shadow

This is just my favorite list. No hate to anybody. If you need any recommendations you can take from here. I like mostly dark themes so not many isekai or romcom sorry.