Actually I don't see now a decentralized exchange that could give traders a lot of options to trade as they only list coins with low volume and in general decentralized exchange has a very low volume even if you combine all of them and compare it to centralized trading sites.
This looks like a "chicked or egg, which one's first?" argument. Traders argue and complain that dex has low volume but how will it gain volume if they don't use it?
A quick fix to this is to use an aggregator like 1inch, Paraswap or Matcha (0x). These aren't DEXes themselves but rather look for the best liquidity route from other protocols' pools. In this way traders are able to minimize their slippage as they are always trading from the most liquid pools, at the best rates.