anti depressant help

Dr
So I'm 4 months post partum and I'm on Zoloft for PPD & PPanxiety It really helped with my anxiety, it's been such a relief to have a break from that! But my depression is still there it seems. I still feel disconnected from my toddler, I'm still bummed out during the day, super homesick for my family (mom dad and brother, not husband & kids) I still feel overwhelmed and frustrated. Ect. My dr told me maybe I should look into getting my dosage upped and gave me three weeks to think about it since I'm also adjusting to my new birth control. I'm coming up on the end of those three weeks and I'm not feeling any better but I don't know if I want to go up on my dose. I don't want to have to rely on medication to be happy, I want to work through this and get better. But I don't know if being on the wrong dosage amount could be harmful? Or if maybe my fear of upping my does is just my depression/anxiety talking? 
Any advice? I hope I get some responses I am really lost on what to do. But I understand if you guys have no clue either lol