Hello Dear Friends,
I have downloaded 107 images in relative descending orbit of 27 but the data in 2019 does not overlap (see figure). What should I do to use that data. If it is not possible to use 2019 data, can I use ascending 2019 data with descending for displacement analysis in PSI.

it is quite likely that the data is still covering the same extent. The displayed footpring is jsut an approximation. So if all of the images are of the same relative orbit, you can jointly use them for PSI.