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.
mainly why there are much interested persons into investing in alt coins is related to the bitcoin halving which we are all expecting which will bring about the bull run that will affect other coins in the bull. As a result of how cheap these alt coins are with high prospect of profit that can generate when the bull market arrives but investors should forget that not all altcoins will rise in price along with bitcoin, many projects will remain stagnant and a lot of investors that have invested in the bad coins will lose so much that they won't forget not to stay clear from alts and just align with bitcoin patiently.