Ladies so I'm almost at the 8 month mark of excusebly breast feeding, my son eats solids more and…

Ladies so I'm almost at the 8 month mark of excusebly breast feeding, my son eats solids more and will drink water when he feels.. well I have used up all of his frozen stash and was thinking of starting another one before my journey ends. Hoping to continue until the 1 year mark to breast feed and pump until his 1st bday. I do have trouble pumping now, because I've been feeding on demand. Any advice as to how I can get my milk supply up, so I can maybe pump more.. any advice is greatly appreciated