Exactly as a small trader or investor we can't buy One Bitcoin, and for this reason we can't take profit from Bitcoin holding. For this reason altcoin is best for buying and from altcoin profit we can buy Some amount Bitcoin satoshi for long time holding.
If you cannot buy 1 bitcoin, then this does not mean that you need to refuse to invest in this coin. You can regularly buy a small part of bitcoin every time you have free money. And perhaps when the price of bitcoin reaches its high at a certain time, you will become the owner of a whole bitcoin.