Free list of communities with problems

Hey there fellow IH'ers!

Are you spending too much time scrolling through your beloved Reddit communities looking for people with problems for you to solve?
Cool. Me too.

So, last night I whipped up RedPain, which is an aggregator that searches for posts with problems and displays them neatly into one place.
BUT, I need your help!

What communities and keywords should I add to this to bring us more value?

Current subreddits:

• [x] r/smallbusiness
• [x] r/saas
• [x] r/shopify
• [x] r/woocommerce
• [x] r/etsy

Current keywords being searched for:

• [x] "problem",
• [x] "help",
• [x] "how to",
• [x] "advice"
• [x] "struggle"
• [x] "how do"