Two things that you can affect are to explore and find less known coins which might bring you more profit on daily basis than top coins. I have been mining raven for two months now and it brought good profit to me, maybe even 50% more than i could get with eth. The other thing is to mine and wait the price that you will bi satisfied with. On the time of bull the prices raised but diff raised with prices as well and when the prices went down diff stayed the same. That is the common problem of all miners, just make your own strategy, no worries.