People should avoid crypto exchanges that are struggling with volumes and liquidity, imagine BTC that have massive volume suffering on such exchange, that's shows that the exchange is a failed one.
Never ever use a unpopular exchange, there are many reasons why you shouldn't use them and this is just one of the reasons, I hope this person learn from this big mistakes, and I hope they recover from the losses, it must have been a very painful experience, to even raise a 0.5Bitcoin today seem impossible for many old and new investors.
Even if we want to sell bitcoins in smaller amounts, we should only use top exchanges like Binance or Coinbase. We should completely stay away from exchanges that have no reputation and low trading volume. I've never even heard of the exchange the OP mentioned so it's puzzling that so many people still use it to trade large amounts of bitcoin.
Bitcoin is becoming increasingly expensive and scarce, accumulating 0.1 btc is already a difficult problem for many people, let alone 0.5 btc. 0.5 btc is a pretty big number for most people these days.