Radar indicates the Long March 5B booster designated CZ-5B/2021-035B
is currently in an 162 x 303 km orbit.
In the last 24 hours, it has descended an average of approximately 45km.
Amateur optical observations report it is tumbling.
Once satellites reach an average of about 200km altitude in their orbits,
things tends to go downhill fast.
Current position and altitude estimates here :-
https://orbit.ing-now.com/satellite/...21-035b/cz-5b/