Low milk supply and current left 1 drop of milk can I still pick up my milk supply again?

Yes can. But it will take quite some time. Need to be patient. Best to direct feed. Since you only have drops, u can just massage and hand express every 1hour + direct feed. Pumps can be quite a hassle for now and might not be able to extract milk effectively. Once you have more milk then can start pumping. Try not to focus on collecting the breastmilk, focus on building supply instead. Its ok to just get few drops and wipe it off :) be consistent.