OP lost $600 to a scammer. Then contacted another scammer who promised to help recover his money from the scammers for a upfront payment of $300. In total OP has lost $900.
The OP clearly states that he lost $6000 and another $300 as a result of trying to regain what it lost - which totals $6300. It’s not some complicated math, you just need to pay attention to the details
The same story is repeated over and over, instead of first asking for advice, beginners first lose money and then seek advice on how to get it back. Crypto scammers unfortunately have a pretty easy job nowadays, there are so many naive people in the world that the saying “easy money” has got its true meaning.