Actually, you can buy ethereum as long as you can and hold until the time eth recovered from drastic falls with bicoin.
Majority of crypto people now is taking a vacation while the market is not yet in the good condition. The impact can be fill in the present. One day people will loved ethereum again.
but the problem is that every day that passes a ton of new ether is mined by the miners and is injected in the market increasing the circulating supply of it and since it has no cap to slow it down or stop it at some point (unlike most coins including bitcoin) that means the increasing supply will slowly but surely push its price down in the long term.
something like what is happening to Doge coin. it used to be worth more than 500 satoshi and now it is headed for 10 and less.