My Mum-in-law is in her 70’s and has been lactating to some level now constantly for over 50 years, still feeding my Dad-in-law up to 8 times a day and currently producing over a litre a day. When she wants/needs to increase her supply, she finds pumping one breast, while her husband suckles the other and then switching plus a week of taking Domperidone can double her supply in about 2 weeks.
I know some women won’t/prefer not to take the medicicines (don, meto etc) but they really can be that boost needed when inducing.