I need improvements, proofreading and editing to my motivation letter for a Master in Computer Science.

I have a single page motivation letter that I’ll use it as a template to apply to multiple Master programs in CS. What exactly I need : 1) Coherence : connection between paragraphs, and also within the paragraph itself. 2) Maybe punctuation and letter cases! 3) In some places I’m having hard time conveying what I want. 4) I’m not a fluent speaker, so an overall review to point and correct where I might went wrong. I added comments inside where it’s obvious to me that improvements could be made. I want a writer who can actually write great motivation letters and can give me notes and feedback on my writing. I need an honest writer that can satisfy all those requirements.