I agree that bitcoin is the most popular cryptocurrency for investment. A lot of tools for bitcoin investment appear now and there is a big demand in them.
But also there are Ethereum, BNB and other popular for investment coins that there are in big demand.
It is very important to evaluate the future potential of the coin to understand how useful the coin will be in the future.
The coin must be in demand and used to grow in price.
If a project offers a useful product people will use it and its coin or token will be in demand.