Is it permissible to charge money for an online Islamic service? If we don't charge, how can we advance?

Salams all - I'm wondering about charging money for an Islamic dream interpretation service that I provide via my online tool Dreamstate (https://dreamstateai.replit.app/) . It costs me money to provide the tool (about $100 per month for various AI products that support authentic interpretations), not to mention the time away from paid work to build and improve it (significantly more $). The first 3 dreams are free, then I currently charge a minimal amount for lifetime unlimited access ($4). I have had feedback that Islamic services like this should be free entirely. But if I charge nothing, I can't continue to work on it. As a skilled revert who is otherwise unsupported financially, should I give up on building Islamic tools and go get other work? Then my skills would not be used to benefit the ummah. How does this work? I understand the premise but surely the context matters. Have genuinely been wondering about this for a while so any insights from anyone = appreciated