First of all - no offense - but it does not sound like you know what you are doing...
Exchanging money is a sensitive topic. If it fails and the money is gone, users will be angry. Rightfully so.
So getting it right is important. Having no skin in the game, is not trust-inspiring.
That being said, what you are looking for are market makers or liquidity providers. So if you can convince some that your platform is sound, they might give it a shot.
But then again it is a chicken and egg problem. Usually network effects are self-perpetuating. Why would someone put their capital on your platform instead of on UniSwap?
And the whole exchange idea: what is the point of some "simple exchange" website if it gets routed through a CEX like Binance anyway? Just go there directly, and have more trust and customer support in the first place.
Yeah, why would someone use for example simpleswap instead of binance?
As i allready said, you need to verify with id on sites like binance, not everyone wants to do that.