What type of surgery will improve my smile and show my upper teeth when talking? (photo)

Currently when I speak, my teeth don't show (think, Robin Williams). This makes it hard to pronounce words and I'll slur occasionally (very embarrassing). As a result, I don't smile much and so people assume I'm unhappy/insecure. It's hard to describe how frustrating and discouraging this is. I've had ortho work done and have a good bite now. I'm researching options to fix this and have consulted with two dentists so far. One suggests lengthening the front teeth by 3mm (which I don't think would suffice and it's not worth the $20+ bill) and another thinks jaw surgery might help. Other ideas This is something that's been bothering me deeply for decades (or since I can remember) and it would mean a lot for me to fix it. Anyone have experience with such a case (personally or know someone)? Ideas/suggestions to fix this? Combination ortho and cosmetic (lip lift? le fort 1?)? Speech therapy? Anything. I'm casting a wide net and want to get all options, so any ideas you have, please share.Attached is the biggest smile I can managed. And when I speak, can't see any teeth (+ annoying slurring occasionally). Arghhhhh.Thanks.