Need advice!! Do I need to pump?

An

My LO is 14 months and still breastfeeds. I recently went back to work and idk if I should be pumping. I don't want to lose my supply as She doesn't want to eat a lot of solids. Unfortunately what I do pump goes to waste Bec she won't drink it out of a bottle/cup/silly cup. She also won't drink regular cows milk 😣. Do I need to pump to maintain my supply? And do I pump both breasts? I feel like by the time I get home my tests are empty and she doesn't get enough of breastmilk even though I pump only once during a 9 hour shift (including commute). I've pumped both breast too.

Any advice would be incredibly helpful!