Just carry on the way you have been, some take longer than others. Best advise I was given was wait until the child is ready, sounds like your little one is. I forced my oldest, took months, next time round was advised to wait until ready, was done in a couple of days. It will happen, though I do think that pull ups still feel like nappies, so can take a bit longer to train, but that's just my opinion, they weren't around for my first 3, did try them for the last 2, but felt they didn't help the children, but were better for the parents, (since they contained any accidents).
You'll get there.