I agree with increasing weight every week however I do it on a 6-week cycle with the 6th week being a deload at about 50% of my 1RM for 5-7 reps. You might give this a try as well as adding in some pause reps with moderate weight or heavy rack pulls depending on which part of the lift is most difficult for you, rack pulls if you're having trouble locking out and pause reps if you're having trouble getting off the floor. Another thing that has helped me before is hip mobility exercises lightly before deadlifts and squats and more intensely post workout, try that for a month or two and see if it works for you as well as it did for me. The Natty Professor on YouTube has some great videos on increasing your deadlift btw