You can buy more ethereum right now because price become cheaper.
ethereum will reach over $ 100 or only $ 80 which is what we expect ethereum prices to rise rapidly to bring in more profits for investors, I do not want price ethereum continue to decline
It is not a right speculation, anyone who is speculating the price of Ethereum to reach there will regret in the future as I know it will not reach to that in the future but will rise to high value. Anyone who will wait for the price to reach to lower value which is mentioned in the OP will lose the opportunity to buy some Ethereum in the current lowest price.