Upgrades for competitive Brimza, blight of Oreskos precon deck

Hi there! I got a Brimza( Growing threat) precon that I’ve really enjoyed playing . The problem is I’m not sure how to really bring up its power level into a more competitive deck. I’ve placed 1 or 2 cards in, played with it and I already see card draw as a problem. Is there anything else I can do/ cards I can replace so that it could be really strong? Please let me know! Have a great day!