Self-improvement search in the 4chan archives
A habit logging website with detailed analysis of your habits.
An Instagram /sig/ page.
A thread from /fit/ about dopamine detoxing and impulse control.
An archive of self-improvement resources on MEGA.
A playlist of lifting motivation for Europeans.
Another very good self-improvement archive Telegram channel.
Introductions to different philosophical ideas from throughout time.
Practical advice about how to improve yourself.