Lost my identity when I became a dad and it took a while to get it back
First few years after my son was born I literally became just 'dad' to everyone including myself. Every conversation was about him, every plan involved nap schedules, I didn't have a hobby anymore. My buddy called me out on it and it stung because it was true. Been slowly rebuilding stuff - started running again, joined a league softball team, even picked my guitar back up. I'm still definitely dad first but I'm also just me again. Took about 3 years to figure that balance out though. I think the key was my wife basically forcing me to take time for myself, I was too deep in it to see I needed it.
Did you find ways to get back into your hobbies or interests? I'm wondering if that's what helped you rediscover yourself or if it was something else entirely.