AccidentalDenz
Lord of Steam
As someone who has a somewhat large Steam collection (2.638 as of today, but who's counting?!), I use a range of third party tools and websites to help me keep track of all the things. This article has a few of them - https://www.makeuseof.com/tag/6-tools-for-getting-more-out-of-steam-games/ - including sites that allow you track how long Steam games will take to complete, the estimated total value of your Steam collection (I can't bring myself to actually check mine!), deals on your wishlisted games, there's even a site which will spin a wheel and recommend which game in your backlog to try next.