This is a very bold step to invest the whole amount in just one cryptocurrency, to be frank I would say it is not a nice idea, it is better to be split into 2 or 3 coins or at most into 5 coins with the potential to rise in the future. To start with, Algo would be a nice one to research on, this is because a lot of projects are migrating to it and that would lead to more value. ETH is another which shouldn't be missed because of the long term value and the hardworking team behind it. BNB, ADA, SOL and FTM, are also good. The reason is, a good team plays a vital role in the future growth of any coin and that's what these coins have in common.