I cannot find any real reason why you should spend your bitcoins in order to shop online.
In my opinion, Bitcoin has a bigger value than the one right now so it is not worthy spending them for shopping. It is better to keep them in your wallet and consider it as your investment. If you want to buy something online use a stablecoin...
Its quiet sad you see Bitcoin as investment rather than a digital currency for transaction of goods and services. Bitcoin was never meant to be an investment coin, but rather a digital currency like fiat currencies. But its quiet unfortunate that Bitcoin is seen as an investment entity rather than a digital currency.