Best tools for understanding what Reddit users say about your industry?

I'm building in the HR tech space and I keep finding gold in Reddit threads — people complaining about existing tools, asking for recommendations, sharing what they pay. But I can't manually monitor 20 subreddits every day. Is there a good tool for this? I've tried some social listening tools but they're all either too expensive ($500+/mo) or built for PR teams tracking brand mentions, not founders doing market research and lead gen. Ideally something that would surface relevant threads, maybe help me craft a good reply that doesn't feel spammy?