>>289621302
Use the material combiner, it's better then nothing.
Try to pair 2k textures into an atlas with 4 mats to create a 4k atlas(resize to 2k in Unity) and you now have about 7 or 8 materials.
Try to pair similar materials, like all armor on one atlas, cloth on one rtc.
Don't feel bad just because it's alot of mats, it's easy to fix.