Depends entirely on the person and what they like.
This is no different than asking someone for top three tv shows for someone new to TV.
But that being said.
Mushishi https://anilist.co/anime/457/MUSHISHI/
Supernatural, mystery vibe.
HUNTER×HUNTER (2011) https://anilist.co/anime/11061/HUNTERHUNTER-2011/
Cult classic, superpowers & adventure.
Yuru Yuri https://anilist.co/anime/10495/Yuru-Yuri/
Slice of life, school-life, cute
In my experience stuff like this starts with your primary healthcare provider.
They would research it on your behalf or connect you with a specialist on that topic.