While I do BB squats I often do not have a spotter so in case of trying to get PR I find it a bit risky and hence my squats numbers are not increasing as much as I'd like to.But in case of a DL it's not much of a hassle doing alone.I was wondering if I could increase my lower body strength using DL and then it will help in squats? Current PR's: BB Squat 90kg,DL 100kg. BW is 62kg.
Yes, deadlift improvements can contribute to squat improvements. Both of these barbell movements train the back and legs.
However, please consider "The First Three Questions" whenever you see less progress than you want or expect.
By the way: The squat cannot be spotted properly by a single person; two people are required -- one for each end of the barbell. And, if you fail a squat and the squatters help you, then stay with the bar; don't bail completely and leave it in their hands.