That's nice of you to continue to try but if it were me, I would be pulling he plug. Too young, plain and simple. If at ANY point he would communicate to you to go potty, then of course, I would take him, but I wouldn't do anything beyond that at this age. He is at that age where even my own kids went through a phase where it was " fun" to go potty but once the novelty wore off they were just not interested. Both mine were 3 when they decided they were ready.