After reaching lvl 60, you will need about 6 months to continue SRS-ing/burning latest items. The amount of reviews does not go down for months after hitting 60.
Today WK started the only sale event they run - Lifetime Sale 2020-2021: The Moment We've All Been Waiting For
so it’s the best time of the year to get lifetime since you have not invested any money into monthly/annual payments.
OTOH, if you will dislike the site after two months, it will be a waste.