I usually Invest a very small amount of bitcoin to another coin because I know this time is very crucial to invest in any new coin or even in an old coin.
Any suggestion from your side which is good for long term
There is a lot of altcoins that can possibly give you a profit you need to select a good one or two, for now i think it is not too late to invest in different or top altcoins because bitcoin is just starting to rise and there is no other good option for now than selecting a good coin and hold because after bitcoin rise altcoins will surely follow.
Agreed with the rise in price of bitcoin the value of altcoins will increase Ethereum and BNB are good and top among altcoins for long term investment. There is still plenty of time for bull run currencies to rise further.