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
I think no need to invest in other coins this time holding will be the best option for you. I have seen many people who first have Bitcoin and then sold for $19k and now they are crying. As holding requires some time but it is very effective and most holdings in the bitcoin have a positive effect on the investors. There is a slight difference between other altcoins and the bitcoin it is different if we are holding other altcoins then we didn't expect much from them. But if we hold bitcoin we should expect more as per our choice that it will go as far or it will be at his place.