There were many animes similar to "About My Reincarnation into a Slime". Here are some recommendations: 1. Steins;Gate 2. Attack on Titan 3. Tokyo Ghoul 4 "Even a chuunibyou needs to fall in love!" (One Piece) 5 Demon Slayer 6 Sword Art Online Future Diary (Future Diary) 8. A Certain Scientific Railgun Chapter 9: How to Train Your Dragon Speed Otaku (Initial D) The anime genre recommended above was similar to "About My Reincarnation into a Slime". They were all sci-fi, adventure, fantasy, and elements such as emotions and growth between the characters. I hope it will be of help to you!