Your mount can use its reaction to impose disadvantage on any melee attack directed at you. With Warding Bond, it might improve your AC even further though absorbing half your damage. You can also use a reaction to Forged Protect for one more +5 AC if one thing looks like https://warforgedfighter24679.blogsumer.com/27782871/a-simple-key-for-elf-personality-traits-unveiled