AdSense is worth chasing. The passive income is real and it compounds.
But it takes time to qualify and even longer to pay meaningfully, and most people have something more valuable sitting unused while they wait.
If your content teaches something, viewers will pay for one-to-one help with their specific situation. This works at 500 subscribers. It does not require a big audience, just a clear offer and a way to book.
Calendly handles the logistics. The free tier is enough to test demand. You will probably want the paid version once you are taking payments through the platform, but there is no reason to spend anything until you know people are booking.
The part most beginners miss is saying it out loud in the video. Not just a link in the description. A direct spoken line near the end telling viewers exactly what you offer and how to get it. That one habit is usually the difference between a channel that earns and one that just grows.
Run both in parallel. Just do not wait for AdSense to be your starting point.