I just usually leave it outside to get as much sun and heat. Eventually it will drop all the damaged leaves, at that point, you can choose to prune some branches in case it is getting too uneven. As long as remaining branches/stem remains firm it will bounce back.
Leaving it outside also allows more continuous airflow all around it, so it helps in its recovery period. This would also be good time to check condition of the roots, and perhaps improve media by making it grittier and well draining.
I do not know if your summers are rainy or not, so if its too rainy later on position in an area with awning..my area is hotter and drier so they do recover faster staying outdoors, with nothing sprayed on them.
This past winter season was a bit terrible here too..my Crassula ovata got lots of fungal issues..but it is recovering now, shedding ugly damaged leaves and new leaf growth in active mode.
Photo last Feb 2022, if you look closely fungal spots everywhere..but new growth has likewise shown up, and lower leaves drying up, so plant redirects energy to new growth:
Crassula ovata 'Gollum'
also had similar problems..but it is thankfully recovering too as weather is now warming up much better. In the photo below when you look closely you will see the fungal spots in various areas. Main trunk is doing okay..quite fat and firm like a rock, no soft spot, so I am reassured it is enduring well even with those fungal issues.
Photo 06Mar2022
Just have to be very patient, at times it takes a slow time to adjust/acclimate itself again from ongoing seasonal.changes.
