The best time to buy ether should be when the price of ether is cheap and there is a positive sentiment as regards Ethereum developments and it's growth. The news of ethereum upgrade will cause price spike, buying ether when price is rising is a good timing!
This is probably one of the best moments in the cryptocurrency market in the last year when you can easily make money in a short time, Ethereum has attracted all the attention
before that Ethereum made many people almost desperate because they were disappointed to see the movement down. but people who are not desperate and always eager to run their business and of course patiently wait for the development Ethereum will soon find something surprising. Ethereum will definitely rise and will surprise everyone who is still with him. Use good opportunities to buy or sell by looking at Ethereum's situation and movements.