Positive success stories for late term preemies?!?

5 days pp and im exhausted obviously. Baby boy was born 35 weeks and some change. He is so tiny. Only 4lbs and 8oz day of birth and at his first pediatrician appointment he’s 4lb 4oz. Pediatrician said to try and breastfeed him 5 min each side then formula and I try my hardest to breastfeed and it’s a 50/50 chance that he’ll take it or not. I just want to know that people who used formula for their preemies have had success!!? Just in case I can’t keep up with breastfeeding and pumping. I have to basically do all three and it’s exhausting and I just want my little guy to grow happy and healthy 🥲🥲 he only eats like 15ml or 20ml right now and that’s on a good day he usually falls asleep mid feed and I try everything. Taking his clothes off, wet wipes, sun, burping etc!