What are your lifts, BW, age, height?
Most importantly, what is your programming like? As others mentioned, it is a challenge to increase strength under these conditions, so your programming needs to be spot-on. A 2-day Texas Method setup might work (e.g. volume Monday, intensity Thursday), but recovery might be difficult depending on your sport.
Or something like this which I just stole from another forum:
Day 1 - Squat/Press
Day 2 - Bench/Deadlift
Week 1: 5s
Week 2: 3s
Week 3: 2s
Week 4: 5s
Week 5: 3s
Week 6: 1s
Work up to one top set, and one back-off set (keep volume relatively low).