Twelve listeners after five years is a signal, not a reason to quit
Quote
If you've had a podcast for five years and you still only have 12 listeners, it doesn't mean that you need to stop because you may enjoy, you may be doing it just because you enjoy it. But it does mean that it's probably not content that a lot of people are ever going to be interested in.
Episode 203: Tweak my Tweeters (episode page, opens in a new tab) 01:14:15 (play audio from this timestamp, opens in a new tab)
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Summary
If a podcast still has 12 listeners after five years, you don't have to stop; you may be doing it because you enjoy it. Dave says it does mean the content probably won't interest many people, so if your goal is making a living, something needs to change.