Good deeds do increase your iman, but it can be reached at its peak by cutting down on sins.
Sins are like holes in a bucket. Your good deeds are like water, purifying your bucket (your chest of deeds). Don’t allow the water(good deeds) to seep through the holes (sins), leaving behind an empty bucket.
Be vigilant please. Cut down on sins step by step. Reduce your indulgences in sins one small step at a time. Make dua’ a for yourself.