Okay, it’s really a bit strange and scary to use completely unknown websites for money exchanging. To trust the project, I should be sure in its legitimacy and reliability. If your platform is actually safe, try to familiarize users with it. Start PR campaign, reveal more info, idk. Probably, you can ask some reputable sites to write a review on your exchange (you can check this example to get what I mean
https://www.katiewager.org/changelly-review ), this is a common way to increase audience. Don’t hope that users will trust you immediately. We all know about tons of crypto scam, so we are a bit paranoid community