Don’t be afraid to reset. You might have forgotten items from the most recent level(s) naturally after a month of not reviewing, so it might be faster to have a lower review pile to clear out and just redo the amount necessary…
You can use this script to feel the impact of a reset on your current review pile.
Also, WK is adding right now a native feature to sort by lowest levels first. You could also take advantage of this & reset when you aren’t remembering anything anymore to the level of the items you’ve arrived at.