Are you saying you accepted that you can't recover your losses and move on from gambling? The move on you are talking about is that you are advising the gambler to quit gambling or you are saying they should gamble with the intension that the lost funds can't be recovered? The mistake most gamblers do is thinking they can recover their losses. There's no recovering of any money lost in gambling, just keeping gambling within your means and don't center your entire life on gambling, have a life outside go gambling too and you see that gambling losses won't affect you that much.
That's a fact. The losses cannot possibly be recovered anymore. We must accept that.
Moving on fast will be tough, but that's the only way to start fresh again. Make it a lesson and live every day thinking about the losses you made and how frustrated you are after losing it all. I think OP must now be thinking about quitting, but it's best not force it if you can't. Slow changes can help. Find another hobby. Gamble in your spare time. Use the smartphone if it's available, because it will run out of battery, and that's a sign to stop.
There are many ways to slowly get away from gambling and treat it just as an entertainment, but it starts with the mentality of the gambler.
If one cannot let go of his losses, he will always come back for revenge, and that's a sign of gambling addiction that we must avoid.