My daughter potty trained early herself around 26 mos, then regressed after having her tonsils out and then her little brother came along. Two in diapers was not fun! Nothing seemed to work the second time around.
After her third birthday I signed up for a "santa call" from our local rec center. Where they had people call and pretend to be santa around Christmas talking to the kids. One thing I put on the list was that she was potty training again. So Santa called her and told her how proud he would be if she stopped wearing pullups and he had great big girl toys for her that Christmas, that was it, she was done 100%! :) She hung up went and put on her underwear and it was over. Honestly it was that easy, day and night it was done.
That may or may not work for everyone, but it was finding what worked for her. Same with your child, something is important enough and it will be something he or she has to work towards. A call from a favorite character giving them encouragement goes a long way! :)
Also for my son at 3, he wanted a Transformer. I told him that was for big boys. He started earnings stickers for it. It took literally a week and he was done. He wanted that Transformer. I bought it ahead of time and put in on the fridge so he could see it and knew what he was working for.
You need to be able to put them on the potty every hour to hour and a half, DO NOT ASK IF THEY HAVE TO GO or wait for them to tell you. Just simply and nicely say "it is time to try to go on the potty, if you don't that is fine"...don't tolerate protests, just ask nicely and even have a timer if you have to. This helped my son a lot as he knew how just got so side tracked in playing and if you ask a child 98% of the time they will say "no I don't have to" even if they do.
If nothing works. Let it go. Give it a breather for a month and wait. Pushing will lead to power struggles. They are in control at this age. If he/she has all the signs, waking dry, able to hold it and is ready they will do it. I trained both of mine in pullups, to take the stress factor out of it, keep pee and poop off the floors and be matter of fact. With my son by the time he was 3 1/2 he was fully potty trained day and night. Neither of my kids have had problems since it was done.
Good luck. When it turns into a power struggle, the best you can say is "well when you are ready to be a big kid, let me know" Same with priviledges that go with being a big kid, keep them limited and remind them that those things are for big kids, big kids go on the potty.
HUGS