Have I ruined my supply at 6 months?

Hi all

I’ve almost exclusively breastfed my baby, although supplemented with one bottle of formula each day.

For various reasons the last two weeks, including sickness, we’ve had to supplement with more formula - probably around a 15oz a day.

I’ve been trying to switch back to most breastfeeding but noticed how empty I feel. I tried my breast pump on each side, just now, and only a few drops came out.

I’m so sad.

Is it a lost cause now? Have I ruined my supply? Is there any way to go back?

Thanks for your support.