Based on the existing answers and the question, it appears that the best option for finding a decentralized exchange (DEX) aggregator is to try OpenOcean.finance or Paraswap. Both of these platforms offer a range of DEXs with varying liquidity, with Sushi having the highest liquidity but still relatively low. It is important to do your own research and compare the different DEXs available to ensure that you are making the best decision for your needs. Additionally, it is also important to be mindful of the security measures in place for each exchange as this can help ensure that your funds are safe.