Well, I think you've made it difficult for me, because there are so many good ones, but if I had to recommend an anime with my eyes closed, one that is high quality and won't disappoint, it would be "Fullmetal Alchemist Brotherhood."

But I can recommend a few more that I love, in no particular order:

1. Kimetsu no Había
2. HunterXHunter
3. The Apothecary Diaries
4. Bleach
5. Attack on Titan

I have watched this a very long time ago.   

If one wishes to obtain something , something of Equal value must be paid