The price of ETH has increased many times compared to before. And if you still hold 4 ETH then I believe you now have nearly $ 2000 from it, and you can reinvest with this money. If you invest carefully and scientifically, I believe you will quickly get back profits in 6 months
Yes, $430 x 4 ETH = $1720 to be precise. If he still got hold on the last 4 ETH, he is at least got half of what 14 ETH was worth back in May (~$3000, I think). This is what crypto about and everyone should never give up hope because the chance you can earn back your loss is there.
Yes, with over $ 1,700 I believe he will have a lot of money if he invests in good projects. Look for Defi projects, the price can go up many times and with luck OP can make more than 10k $ from it.