@marla, I was in exactly the same situation last year. It’s not much help to you now but might help others that in advance of the subscription expiring I made sure all the relevant reports required for my tax return had been exported and saved, and I ran a regular backup so the data was accessible in a raw form.
The power user subscription prompt is, as QFMathew says, based on there being over 1,000 entries in the previous rolling year, so as time goes by the number of entries in that window will fall until sometime within the following year you’ll have access again, and for my purposes this was in time to do some final adjustments before filing my tax return. What I hadn’t done was export the usage report by date which would have allowed me to know exactly when I’d have access again, but if you know how many transactions there were and they’re evenly spread throughout the year you should be able to make an estimate.
Pretty low priority obviously but it would be nice if it displayed the date or countdown to when you’ll be back on a free tier again.