LU (summarizing others) “That is how the Rambam defines an Eved Hashem – as someone whose entire purpose in life is to serve Hashem and EVERYTHING he does is for that purpose. This is a chiyuv and not a chumra.”.
That’s a lot to expect from yourself though. I think the OP was talking about more realistic and practical definition. One that you could measure yourself against.
I would go with the Mesilas Yeshorim definition of zeirus.
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To find what needs changing, and try to change it. I think that’s the minimum requirement.