What should we do?

My 2 and a half year old was going on the potty occasionally. Now that I'm home for the summer (I'm a teacher) we've been trying to get him to go more consistently. He has refused. I don't know if he's just enjoying time with me at home and doesn't want to take a break to use the potty or it's something else. He has just refused recently. We push, but we don't force him. What else can we do to get him to use the potty more? We've offered him praises and prizes, but nothing has worked yet.