Instead of creating a new dex, why not build tools for dex users? I think the competition for those projects is lower compared to DEX. You don't have to find liquidity and fix other problems either, just make sure you can provide unique features and compete with existing dex tools like dextools and so on. Aiming for other chains such as Solana, Matic, etc sounds like a good idea to try.
Yes that´s a good idea, but i only know dextools do you know more?
Since you mention Binance DEX (although few people argue it's not really decentralized), you should look on Uniswap where it's source code available at
https://github.com/Uniswap. But if you're looking for DEX which can perform exchange between token/cryptocurrency on different blockchain, check Bisq instead at
https://github.com/bisq-network/bisq.
Bisq is great and i like, but i think is not possible to create one.
[moderator's note: consecutive posts merged]