one way could be by hosting or ctrusted cloud service, they are there for this exactly reason, casual mining is not feasible anymore, but decentralization is still vastly possible
i think there should be more hosting service if we want to help decentralization, those that have the best electricity cost, should help the other by providing good hosting, even a small profit could encourage the growth of more small miners
well but the diff in theory should increase too, otherwise no miners out there will make profit no matter his/her electricity, for now there is profit to be made, the problem is that ROI is too long to accomplish