Could these sentences be used to ask other people to perform things above?
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Answer is, no.
Following are not orders, not requests:
Following may be subjective:
These are not orders, not requests, but has the nuance " let's 頑張る ". If your boss says 「みんなで頑張るぞ」 (let's do this together) you can consider that's an order or being voluntold.