Which of these following projects do you see as a great investment and
why?
- Cardano (ADA)
- Polkadot (DOT)
- Avalanche(AVAX)
- Litecoin (LTC)
- Cosmos (ATOM)
- IOTA (MIOTA)
ADA and DOT is good choice but I more prefer to ADA, started to buy and hold for long term.
Many suggestions have been given and most are ADA, DOT, maybe you OP can still invest in all coins you have mentioned, it's just that the percentage is lower than the coins that are recommended.
Now is the time for you to start investing and don't forget to save it in a hardware wallet because your investment value is high so having a hardware wallet is not a problem.