It's good if you're contented with it but if you can earn more without going lower than your limit you should go for it. You will also benefit from it so earn as much as you can. Bitcoin's price is increasing yearly so earn as much as you can so you can be rich in the future. Good for you you have 21 btc but me, i don't have even a quarter of 1 bitcoin. But i continue earning it as long as i can.