A backlog is not a moral failing, and the usual advice — stop buying games — does nothing about the pile that already exists. The useful first step is finding out how big it actually is.
Measure it in weeks, not games
"Thirty games" means nothing. Thirty games might be 200 hours or 2,000, depending entirely on which thirty.
Add up the completion times and divide by the hours you genuinely play in a week — not the hours you intend to. The result is usually sobering and always more useful than the count.
Sort by length, not by excitement
Finishing something changes how the rest of the pile feels. Two eight-hour games completed does more for momentum than forty hours into a sixty-hour game you have stalled in.
Start with the shortest things you actually want to play.
Main story counts as finished
Completion time and main-story time are often two to three times apart. Deciding in advance that credits rolling is the finish line removes most of what makes a backlog feel endless.
You can always return for the rest. Most people do not, and that is fine.
Abandon things deliberately
A game you have not touched in six months is not in your backlog; it is in your library. Moving it out is not failure — it is the difference between a list you might finish and a list you definitely will not.
Watch what you paid per hour
If you are buying faster than you are playing, cost per hour is the number that makes it concrete. A game you play for five hours cost you far more per hour than the same money spread across two you actually finish.