I'm happy to help you improve the wording and tone of it after you have a draft to make it sound more native English :)
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I'm trying to write this letter right now, too. Psychology plays a very important role in the teaching process. As for the question of writing a motivational letter, so itself. At https://studyhippo.com/essay-examples/psychology/ I found useful information in general about psychology and psychological techniques that help to compose a motivational letter so that you will be accepted.
Hello, I study abroad at university in the UK, could help you with the motivation letter!
That would be great, how can we get to work? Skype? or maybe contact me on my instagram: bythewaythyago