This might just be my simian brain looking for patterns where none exist but I feel like my nominations stay longer in queue if I take a few days break from reviewing as compared to when I’m power-reviewing.
Could it just literally be because I’m actively shoveling other noms out from the queue and hence there’s room for my own?
Could it be a passive reward kinda thing where the higher your review count and/or wayfinder rating, the higher in priority your nom is?
Or could it all be pretty much random and my brain is trying to convince me it’s smarter than I give it credit for?
There is no direct relationship between reviewing other people’s submissions and your own submissions being reviewed.
The only link is what you said in your second sentence - the more you review, the more you help clear the local queue and the more room for your own nominations to enter the queue and be reviewed, but even that is a minimal impact.
Imagine 100 people have to review each submission. You would need to review 100 submissions to remove a single one from the queue (on average).
(Your brain probably is smarter than you give it credit for.)
Your local backlog certainly has an influence. Now, how much of the local backlog you can credit yourself with pushing along is hardly possible to estimate, but it stands to reason that actively reviewing helps reduce the overall number.