There are so many different programs that work. A couple things to consider...
#1. Don't always pull singles from the floor. You will burn yourself out way to quickly.
#2. Use deadlift variations. Rack pulls, block pulls, deficit pulls, Romanians, Stiff Legs, etc... if your gym has them, you can use reverse bands and chains to work on top end lock out strength.
#3. Make sure you are appropriately training your accessory muscles (hip flexors, hamstrings, upper back, etc)
#4. If you want your deadlift to go up... Focus on your deadlift. Train it on it's own day...
Couple questions for you...
Are you a powerlifter?
What does your current deadlift training look like?