What's the best and quickest way to sort my crossbite? (photos)

I am so unbelievable conscious of my crossbite, when I smile it looks like I am missing a tooth. I really want to look in to getting it resolved as quickly as I can without them being visible. I have been looking at Invisalign and lingual braces but not sure if they would work and which would be better, any advise would be really appreciated. Thank you very much in advance !

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