It'll just be a typo.

Your wondering is for good reason: "Choose to be grateful" is what it should be.

It appears to be a typographical error or a grammatical mistake in the quote you provided. The correct form should be "choose" instead of "chose." Here's the corrected version: "Internally, it’s like you can choose to be anything you want to be. Choose to be happy, choose to be joyful, choose to be grateful, have a great attitude." The use of "choose" aligns with the grammatical structure of the sentence and conveys the intended meaning that individuals have the power to make positive choices in their attitudes and emotions.

Yes, typo, or mistake. Also, is should be 'have A great attitude.'

That's definitely a typo!