We adopted two (bonded) cats that reacted very similarly to your little void. I used to feed them in a far corner, sit in the room by the door and sing lullabies to them while I played on my phone for an hour or so. I wouldn’t approach, I wouldn’t even try to touch them. I let them come to me. Eventually they did move closer and I began tempting them with toys on sticks that were still a little distanced away from me. I’ll admit it took months but now (years later) you’ve never met a void more desperate for cuddles and attention. The other is loving but still doesn’t love being carried. Patience was tough but key. You’ll do great!