I would personally sell it. I did something similar recently. I started staking with 1m on my zerker and got all the way up to 45m and decided I would stop playing rs as it just wasnt as fun to me anymore and sold the gold. Made a nice $110 feelsgood.jpeg
Oh the countless "quitting" threads. Only you can make that decision. If you're not enjoying the game take a break. If you're still not enjoying the game after your break, sell the gp and quit