Just keep at it. I bought a yearling colt this year who had nearly no handling, was very shy and wouldn't let me catch him or even touch him. I started touching him while he ate his grain. I didn't have any time agenda, so I only did it for a few minutes daily at either breakfast or dinner. At first he would back off but grain is a good lure. He'd come back and learn to tolerate it so he could eat. That has evolved into touching, haltering, picking up all feet nicely, and blanketing. He's discovered it's nice to be near me and get scratches and attention. Bit of a brag, but I'm super happy with how nice he became, and he even runs over when he sees me.