Those who bought last time are lucky because they easily times two their money if they sell it right after the price rise but only if they will hodl it continuously they can be able to pull more profits. I believe that eth will show an increase and stability in these coming weeks/months because the updates are still on ongoing or are now very close if it hasn't started yet. The best price to buy an eth would be the last time where it dumped more before it recovers.

If you are planning to buy, maybe you can buy some and left something just in case the price declines again or can return to its last times' price but I don't advise you to wait till it becomes 600 as it will now be hard for eth to reach that low.