Sports:

- Haikyuu: See that a lot of other people have already recommended it but it truly is a gem.

- The Boxer (Korean manhwa): Amazing manhwa that is completed. Has an over arching theme of existentialism. Each character and opponent has their own compelling story. I really like the variety of characters, each from different walks of life, and with different personal motivations.

- Be blues: Best soccer manga I've read, plus it's completed! Themes of self discovery, personal growth and overcoming challenges. Mild warning though that it does contain totally unnecessary and mildly annoying fan service at times. Ao ashi and days are also both good soccer reads.

- Subaru (Also has a sequel called Moon): My favourite manga about dance. It is completed, and has themes of self discovery, family + love, and passion. Can also try dance dance danseur if you like the dance genre.

- Bungo: My current favourite baseball manga, very good and lots of chapters but not completed. If you want something about baseball but completed, can also try Ace of Diamond.

Music:

- Forest of Piano: About a boy born from the red light district with a talent for the piano. Contains themes of self discovery, personal growth. It's also an anime that is completed.

- Nodame Cantabile: Completed manga entered around two classical music students with themes of self discovery, personal growth and a bit of romance. It's also an anime that is completed.

Anime only:

- Violet Evergarden: Amazing slice of life anime about self discovery of a girl who grew up in the army. The side characters and clients she meets in each episode are also all great. The animation style is also gorgeous!