Add paused sumo deadlifts as an accessory to your routine to build your posterior chain, increase strength and improve technique. It's a great exercise for glute and hamstring development.
Start off light until you're comfortable with the movement and pick a weight around 50-70% of your 1RM for working sets.
related posts
Add a suspension trainer attachment to the cable machine to hit your back and rear delts in a new way.
Do this warm-up before any upper body workout to prime your body for heavy lifting.
Modern methods of strength development
These strategies will allow you to make greater gains by doing more work in the gym in a given amount of time.