Tips for weaning your baby off the boob?

My son is 10 months old and will start going to day care about 3 times a week next month. He is EBF other than eating solids. He refuses a bottle, refuses formula, and refuses breast milk in a cup u less it’s cold and you have to trick him into drinking it lol.

Please help me. I literally have no idea how to start switching him to a cup/bottle/anything!! Is goats milk a thing? Or should I just let him figure it out? Does he need to be drinking milk during the day at that point? I will still breast feed mornings and nights but I just need him to be able to last 9-10 hours without me while I’m working.