How can I up my weight loss ?

I'm 8 weeks post-op and I've only lost 38lbs. How can I up my weight loss. I need to lose at least 12lbs in the next 4 weeks and don't know if I'll make it at this point. I'm still on pureed, but I can eat about a cup at a time. I don't feel full. I do walk also and work. Please help.

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