Subreddit recommendations pls. which are creative, intellectual, and interesting.

Lately I have been spending unhealthy amount of time on reddit, and I have realized all I look at is pictures, memes and stuff that provides instant gratification, but I want to get out of this habit and spend more time reading mind expanding articles, opinions and something refreshing.

I am already subscribed to r/askscience, r/celerbral, r/worldnews, r/depthhub r/bestof r/todayilearned r/TodayIlearned could you please recommend more subreddits for me please.