My strategy these past few years is to check isthereanydeal.com for any game I want during a Steam sale. Most other storefronts have their own sales around the same time as the big Steam ones and there’s usually at least one that has it at a lower price. There’s also a browser plugin that adds an isthereanydeal.com link to every Steam page, which makes this super easy when browsing for games.

Agreed. You can usually find a better deal on allkeyshop or wherever.

For example, I’ve been waiting to get Red Dead 2 in a sale, but given Steam is currently selling that at 60, they’d have to offer 70% off to equal prices you can find elsewhere.