Actually, the answer is "maybe, but probably not worth it". I know that since the Model 3 came with a RWD long range option, the upgrade is possible if you go through an independent EV repair shop (only a few in the country that I know of) but even a good condition used LR battery pack is very expensive. With the MY since it didn't have a Long Range RWD option I don't even know if it is possible. If you wanted to go "whole hog" you could upgrade the battery pack and have the front motor installed to make your car a dual motor long range... but it would most likely be less expensive to sell it and purchase a MY LR.
Keith