I want to build muscles and strength at the same time that is why I have problems in the accessory areas but to gain strength everything should be specific. That is the problem should I add supplementary work or drop them
Drop all that undulating periodization and drop half or more of the total excercises and read up on double progression that adds reps and weight. Then pick 2-3 assistance excercise with high rep work 6-20 reps for 2-5 sets after your main strength lift. I’m a big fan of Paul Carter’s 350 Method personally for high rep work - its really simple but you have a specific goal. Your goal is 50 reps or better in 3 sets. Once you get over 50 reps with the same load you increase the weight, Again double progression.
Double progression is super simple.
eg.
Bench press - 5x3x200lbs and work up to 5x5x200lbs and then add 10lbs and start over.
350 Method using incline DB press with 60lb dumbells - 1x16, 1x14, 1x10 for 40 reps. Next workout try to get more total reps and hit failure for at least 1 set. Avoid failure for your strength work all lifts should be soild and tight and reasonably powerful/quick, no sloppy form.
That program is the old RSR. It has been around for decades. DO NOT do the assistance you have planned.
If anything, do some easy lat work after your deadlifts, and some non-invasive upper back/rear delt work after your sq/bp. I don’t see a benefit with doing more than this; doing anywhere near the level of assistance volume you have planned will almost certainly be disastrous.