I think the answer to your question is bitcoin. with you asking, I think the best and safest coin in cryptocurrency is very suitable for you personally, because your question, maybe you don't understand cryptocurrency, which coin is worth investing in the long term is the top coin on coinmarketcap. with a large market cap, it indicates a large number of investors in it, and wouldn't it be better to go with the flow?
the top 10 coins on coinmarketcap are indeed worth investing in,
but it's better to look for altcoins below the top 10, because there are still many coins that are undervalued,
for example Dent, Utrust, Pundix and several other coins, definitely don't buy top 10 coinmarketcap, look for the ones will make you rich, good luck.
You're taking more risk from that man. They are eventually undervalued because investors don't see them as valuable enough. It is always preferred to have in the top 10 coins as we can get assurance from them.
Anyway, we all have different market views and perspectives, sometimes we even wanted to invest in new projects or even hyped projects but I guess there is no problem with that for as long as we choose the projects that have a working product that will give us some chances to make a profit.