Had the same problem on my Lexus IS220d, or similar problem.
DPF completely clogged - solution: Cleaning by a specialized company
EGR valve open_ solution: good cleaning.
the car has improved its performance, on hills at slow speed, where I needed 2nd gear, now I do it in 3rd gear starting at 1200 rpm.
Improved performance at low rpm, but it will always be slow, as it weighs 1730kg, the turbo must have a somewhat high inertia, its entry is noted at 2000-2500 rpm.
you have to live with this pattern, not force the car too much, not be embarrassed by others passing you by. that won't happen easily on the freeway