You have 3 options.
1. Discipline yourself by timing yourself on this site for, eg 2 hours per day.
2. Find a hobby that can take your mind off of mangago e.g painting or even just going for walks. It doesn't have to be a hobby tho, u can even watch shows/movies.
3. Lastly, you get rid of mangago from your life completely.
Simple.
5 reply