At the end of this process, you have a re-platformed optimized infrastructure
عند نهاية هذه العملية ستكون بنيتك التحتية قد انتقلت إلى منصة أفضل أو أمثل

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Note added at 1 hr (2020-10-30 21:56:03 GMT)
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For Lift and Shift I would say الرفع والنقل
There is a translation for this term in the link below but I don't think it's a good one
https://attaa.sa/library/download/865/353

Since "Lift and Shift" means moving applications to the cloud without redesigning them from scratch, the term appears to be used with a negative connotation, in a way that makes it less appealing than a complete refactoring of the application
To translate that explicitly we can say
الرفع والنقل دون تهيئة
أو دون إعادة تصميم