Deflated breast 🤱🏼

I breastfeed my 6 months old and once a day my 3 year old. My 3yr old was recently sick so I was feeding her off the left breast while the baby was eating from the right. Now that she isn’t sick anymore my left breast is deflated looking while my right looks huge. How can I get my left breast back looking like the right? I look totally lopsided