Bitcoin (BTC) You can use it to make purchases online and off, or, if you're like most bitcoin investors, view it as one of your buy-and-hold assets in your investment portfolio. It has become more of a safe-haven investment than a currency, earning it a place within your long-term cryptocurrency portfolio.
it is interesting if we can invest our funds in bitcoin, but we also have to adjust to the existing funds, because the value of investing in bitcoin requires large funds and the funds will be held for a long time in it, because the current situation is not good and it will take a long time to get bitcoin recovered.
being able to buy on coins that cost under $1 is the best thing because of the possibility to be able to store large amounts. so if you look at the best rankings there are several coins that can be taken like ADA.
but if you really force bitcoin, you can buy it in installments, it doesn't need to be in units, or you can go to ETH, BNB is quite interesting too.