Register changing

Of Mice & Men - Second & Sebring (informal register)
Come back so I can say thank you for this,
Home cooked meals and a place to rest,
My troubled head when you're away,
I've passed the test, I've earned an A,
Not just in school, but in life,
You'll always be right by my side.
To help me show, hope to all,
That are lost and sick in this dying world.
I'll use the love you left behind,
I'll change their minds, I'll change their minds.
Edited to have a formal register
Return so that I may say much obliged,
Residence prepared dinners and a bed to lay,
My bitter mind when you are distant,
I have excelled in my examination, I achieved a high grade,
Not only in  academic senses, but also in existence,
You will forever be next to me,
To assist me in my goal of providing promise,
To those that are misguided and ill in this moribund planet,
I shall utilize the affection you had previously given,
I shall alter their thoughts, I shall alter their thoughts.