put all one's eggs in one basket

have / put all one's eggs in one basket (to risk losing everything all at once) — рисковать всем, поставить все на карту

Example 1: I’ve long advised that bloggers seeking to make money from blogging spread their interests across multiple revenue streams so as not to put all their eggs in one basket. (problogger.net)

Example 2: I cannot help but feel that he is the author of his own misfortune. To have put all his eggs in one basket (banking) is bad enough. To have put them all in the same corner of the basket is foolhardy. (news.bbc.co.uk)