I would at least try to earn another year of Silver Elite (15 nights) and also a total of 23 more nights overall (250 lifetime) so you have five years of Silver or higher, thus qualifying for Lifetime Silver Elite and preventing your points from expiring.
Then resume your quest in a few years or decades, whenever your travel resumes.
Incidentally, your earnings history is a bit confused. Marriott Bonv°y counts the year in which "earned", not the subsequent year in which "used", so do you really know you will stay 50 nights in 2022?