Appropriate hydration and baby to breast are the only real ways to increase supply. Some people made anecdotal claims about certain things helping.
Getting baby on both sides every feed, staying hydrated, pumping between feeds
I’ve tried everything under the sun and the only thing I noticed that made any substantial difference in my milk production was Body Armor. When I stopped drinking it, I produced a couple ounces less than normal. So, now I make sure I don’t go a day without it. I stick to the low sugar flavors and dilute it with water.