my indoor ligustrum has not been looking too well of late.

That says it all. Ligustrum is a hardy genus & not appropriate for indoors.
Even tropical bonsai should be outdoors for the summer if at all possible.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)