Replace the underlined get expressions with another way of expressing the same idea. Note that by doing this you are changing the text from being very informal to being slightly more formal.

I don’t often get receive interesting junk mail. However, an unusual item came this morning. It was headed ‘Are things getting you down ? Do you feel you’ll just never get to do all those things you dream of?’ And it went on, ‘If so, get this great new book today: Manage Your World by Simon Triksta. It will teach you how to get over those daily upsets, and will ensure that you get the contentment in your work that you long for and that you fulfil your dreams. Send €25 today to get Manage Your World and your key to success within ten days.’
Maybe I should get it!