Definitely tackle your existing review pile before taking on any new lessons. Once your daily review workload is back to being manageable again, I recommend coming up with some sort of consistent schedule for your lessons to help manage the workload.
Have you read The Ultimate Guide to WK? There are lots of tips in there about creating a schedule and fitting WK around your life. I’m going about half full speed myself (so, two week level up times instead of one week), and I do about 10-13 lessons every day. It equates to a little over half an hour a day on WK total, split up into three or four sessions (only ten or fifteen minutes each, rarely any more than that). I highly recommend doing a consistent number of lessons a day instead of binging them, because it evens out the overall workload and makes it easier to make WK into a daily habit without getting burnt out or overwhelmed.