With "original plan", I'd most naturally use "stick to" (though "stick with" and "stay with" are perfectly possible). "stick" in this sense is not super-formal either with "to" or "with", but "stick with" does seem slightly more informal to me than "stick to". In very formal contexts I might, if I thought "stick" sounded too chatty, use "adhere to" or "continue with".
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tinanam0102Thank you for the examples. I see "adhere to", "continue with" all the time, but I cannot immediately relate them to my questions above.
tinanam0102Does "stick to" have the