Do you know any tips on how to get my horse to stop refusing? It's a new thing, he used to jump everything.

How do you guys get your horse to get over a jump
Have him checked by a vet! There may be underlying issues to your problem!
Check body, podiatry, saddle, teeth then yourself-has he been over phased, frightened, lost confidence?. If something out of the ordinary happens rarely indicates a horse rationally decides that THAT is how he is going to evade.
Maybe something's hurting him? Have you had him looked at by a vet? Rule out physical issues first
Some show jumping coaches use to tell their students to canter on a voltage/circle in front of the obstacle. It's easier for horse to just jump over than work on a circle when they have to collect themselves. Ofcourse this doesn't work on every horse certainly.
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