If the goal is investing mid term (3~5 years): Personally, I would invest that amount diversified between BTC and ETH. Maybe 60% on BTC and 40% on ETH.

Now we are probably arriving to the top of a bull run, but institutional investment, like Tesla's, clearly suggest that price will continue to raise after the next correction.

Ethereum in the other hand, is supporting many crypto projects, so if it fails, it will bring many project down with it which in my opinion is a very unlikely scenario.