I always think that buying and holding Bitcoin
BTC is a good idea.
But I am also a strong advocate of not putting all your eggs in one basket and that is why I would recommend you to use a little of your funds (maybe like 20% of it) to invest in
Reputable Altcoins like Ethereum that has proven that they are here to stay and has contributed a lot to the development of Blockchain technology. Bear in mind that this is not a financial advice, I am just telling you my own perspective and the final decision is left up to you.
but in my opinion, it's not a bad thing if we put all the eggs in one basket, but I recommend it only for bitcoin because, in the end, altcoin will follow the movements of bitcoin. even now it's good for investing in bitcoin, before the 4th annual event starts and historically the price of bitcoin always increases after the event. I continue to buy bitcoin when it goes down quite deep.