Past performance is no indicator of future results. There have been many traders who are 'on fire' for a few months of a couple of years and then burn out and give it all back.
If you want someone to trade an account, go with some recent performance and make sure you have the ability to do real-time monitoring of the account and have a pre-determined drawdown limit in place with the trader/manager.
Yes there are taders that have long-term profitability. But they are few. Just stick with what works until it doesn't work anymore.
That, or you could just take the time to learn how to trade yourself.
It's not the market. It's not the spread. It's not slippage. It's not the broker. It's not the system. It's YOU. Once you stop whining and making excuses, you can start winning.