~ The solution is pretty clear: More projects need to be released that are focused on building sustainable decentralised solutions to enable users to trade and purchase bitcoin (and crypto in general). Right now the main areas of focus need to be security and simple UI/UX interfaces.
Well, it's not that decentralized exchange doesn't exist. Bisq has been operating for a long time but its trading volume is way too low compared to CEX and other less decentralized exchanges. You should probably blame the people who prefer to use Binance or Coinbase. It's the reason why these exchanges are thriving.