I buy both stocks and bitcoin, but bitcoin is only bought and not sold. Stocks are for trend investment and hot mainline investment. The opportunity in the stock market is very good now. After the high point comes out, you can buy some more bitcoins.
Bitcoin is an asset to trade. You can sell it when you wish to. It is not that people don't sell. Profit from bitcoin will be obtained only if you sell, but if done at the right price.
Stocks can be bought and sold as long as you are having the asset in hand or money at hand. These things are not much different from crypto if you are observing well, you will see the similarities. Just that stocks are regulated and well controlled market than crypto.
Both are well to do if you are practicing well. But if you are running only one, then better to keep focus on that.