Fix existing Stock Module or create new. also very few responsive issues that needs to be fixed

Hello There, 1. Site has a date module, where customer chooses a delivery date for an order. There are three weeks where customer can choose from. Items changes each week. Once items in a particular week is sold, it is set as sold out. But a customer is allowed to order items in the rest of the weeks.. Now the fix needed is: We want to do daily stock maintenence instead of weekly. If a day in a week is sold, it is to be set as sold out, but rest of the days in that week are open. same as in the other three weeks. Look at the code in Team Viewer. Need it done asap. Or you can create a new Stock management entirely. 2. There are responsive and speed fixes that our website needs as per google Thanks Rahul Yakosi