Investing in LUNA is a gamble right now due to its unpredictable nature. I don't think investors will trust anything related to Do Kwon or Terra after what happened with UST's collapse lately. If the token never recovers, you'd be left holding the bag for "eternity". As far as ETH and SOL goes, I think ETH is a much better investment. SOL's been facing serious network outages over the past months, with no signs of improvement whatsoever. It shows us how fragile the system is compared to ETH. The bear market severely affected SOL's price, so it's going to take a long time for the cryptocurrency to reach a new All-time-high (if it ever does).

If you really want to secure your future, you should buy prominent cryptocurrencies with a proven track record of development and innovation. ETH is one of them, but Bitcoin, Cardano, and BNB are also on the list. As long as you don't invest more than what you can't afford to lose, you'll have nothing to worry about. Just my thoughts