For me Bitcoin has been my 100% portfolio and up to this point, I am glad that I choose that part even though Bitcoin price has undergone a lot of changes lately, my BTC vs $ balance has shown green and also red-negative movements which is a pointer to the activeness of bitcoin volatilities.
Normally, Bitcoin will be volatile because that's one of its characteristics, and anyone who holds Bitcoin in their wallet will definitely experience a depreciation or an increase in their capital, depending on whether the market is rising or falling. I usually advise people to always make sure they have Bitcoin in their portfolio before adding any other altcoin to it. Bitcoin is not a pump and dump token just like every other shitcoin; most of those coins, after pumping for the first time, may not pump again after they have been dumped, and if one mistakenly ends up putting their capital there, it will be an absolute waste of money. Whoever thinks Bitcoin is too expensive to buy should still remember that even with $5 they can buy Bitcoin, and with a constant DCA strategy, they will be accumulating Bitcoin gradually, and before they realize it, they will have a huge amount in Bitcoin.