breastmilk supply

Hi mummies, is there anyway I can boost up my breastmilk supply? For a couple of days, I was busy running around settling my housing and etc... hence did not pump within the 3hr schedule. (Got times I did not pump straight for 4-5hrs as I couldn't find a suitable place to pump). Today I try going back to my 3hr schedule and realise my breastmilk supply seems to have drop by alot. Is there anyway I can savage it? My LO is only 1 month+ old. I have the intention to feed him breastmilk till he is 6month to 1 year old. ?