So, I have done both - I have reset once after a lengthy break, and I have also continued after not doing any reviews for 9 months. I am happy that I did not reset the second time, to be honest.
When I continued I had about 800 reviews waiting at level 9. My strategy was to work through the reviews in manageable chunks, over several days. My only goal was to get my reviews to a managable level again at a pace that fit my schedule. I had about 70-80% correct answers, and those that I did not get right were almost there, so not many persistent leeches. I started lessons again, when I felt that reviews felt really easy to keep up with, but it took me about two weeks to get there.
Generally, if the thought of resetting demotivates you, I’d say try the reviews and see what your actual failure rate is. If you see that you actually do not remember much, then you can still reset.