When the range passed from 48 to 42 Mpc, one identified guilty was the worsened working point. Today, as already pointed out by Matteo, the working point moved back towards the good condition, and some improvement of the sensitivity has been observed. Here a plot showing the integrated range is added (fig 2): almost 2 Mpc has been gained between 60 and 150 Hz. I think this is mainly due to PRCL noise which is gone, but Michal can evaluate this more precisely than me.
4 Mpc are still missing. The working poiint could be not yet perfect, perhaps a check of alignment setpoint could provide the usual improvement of high frequency CMRF and DET scattered light coupling, but an improvement of 4 Mpc is not expected.
Looking at the sensitivity (fig 3), a problem at the level of high frequency floor is visible. A check of SQZ performance might be useful. If something is wrong there, maybe also some structure (40 Hz, 55Hz, 120 Hz, 160 Hz) could be the scattered light already seen when SQZ was misaligned?