I got my first 100 users but no paying members

Hello everyone, I'm 16 and I recently launched studyfastai.com which is an AI powered study tool. Within 2 weeks I got 150 signups of which no one paid. What can I do to increase my conversions? I have tried to make the whole signup process as simple as possible and I show the users that there is a paid plan. Is this a matter of how much value I'm providing?