The top 3 currencies i would recommend you to invest in are ripple, monero and civic. All of these coins will surely grow in future and will become really popular.
civic is a coin based upon the idea of decentralized identity verification at low cost with help of Blockchain technology. The team of the project is also very strong.
monero is a coin based upon the idea of privacy. It is completely anonymous, secure and untraceable cryptocurrency. It is the first crypto based upon the idea of privacy and is really popular. Within 2-3 years, a price of 300$-400$ is expected.
ripple is a coin based upon the platform of global value transfer and many banks are adopting it for fund transfer. The project has a lot of potential to grow in future. Within 5 years a very high price is certain and is very good option to invest your money in.