Breastfeeding mummies

Any mummies doing mixed feeding would like to share their experience if they are still able to breastfeed till LO is 1 yo by using bottle teats which are say for 6 months and above? As I understand that if I use bottle teats which are faster flow (increase with age), LO might not want to be breastfed anymore as the flow is slower. My LO used to be breastfed but now bottle feeding and I tried to breastfeed back but he doesn't want due to bottle having faster flow..as he is growing, I wondered if I should change to a faster flow teat (now still using 0m+) and still able to breastfeed him? Would like to try bf him back but mixed feeding. TIA!