Second time moms

Her name is Destinee Brooke, I'm sure I posted if her before, named after my two late cousins whom I grew up with like sisters, due may 8th but born april 30th, the same birth month as both the late cousins as well. I just love her so much but breastfeeding is becoming a challenge with an active 19 month old son, my supply is running low went from pumping 3oz to almost 2oz now, I've tried lactation cookies and oatmeal and coffee and water.. so tips for more supply and on my crazy toddler would be helpful :)also feeling sad these days like I'm failing as a single mom because they seem so bored with me, we dont go outside, only for awhile like half hour, dont even see or talk to other ppl so my son has become shy now of others, he use to be so outgoing.. I'm just so scared of the pandemic and anxieties of getting sick.. :( what can I do to to keep my active little boy busy and exhausted?