Help! How to repair thrifted sweater?

I recently thrifted a comfy sweater with the hopes of being able to repair some of the damage… only I have no idea where to begin !

Any tips, advice, or hints in the right direction would be greatly appreciated!
Have a great day :slight_smile:

image|900x1200

Can you show the whole sweater? It almost looks like the pattern is made intentionally like that and it’s not actually damaged. Hard to tell because the color is dark.