There’s technically no limit to earnings in dropshipping. You can earn as much as you’re able to scale.
I have a friend who now makes around $50k per month from dropshipping, and he also started as a complete beginner.
If you’re starting from zero, it’s possible to reach $20k/month within a year too. But to get there, you have to go through failures.
It’s not like you launch a store today and suddenly start making $20k within two months. First you get a few sales, then you test products, then slowly you scale step by step.