It’s definitely not too late to fix. Just can take some time and lots of hard work! Definitely do the power pumping like what Audrey said. Also seeing a lactation consultant for things like this I think is incredibly helpful. They can give you a full game plan and schedule to follow to set you up for success.
I am also facing the same issue! I am pumping every 3-4 hours and skipping in mid night. I am also seeing a drop in supply. Feel free to DM me