The flip side of boundaries is standards―the conduct you hold yourself to. It doesn't make much sense for you to have a boundary that people can't make derogatory remarks about you if you do this to others. By extending your boundaries, you'll be raising your standards. They go hand in hand.
You can choose your standards. For example: "I always tell the truth." "I never raise my voice." "I always show up on time." "I don't give advice unless asked." Choose the standards you are ready for, not the ones you think you "should" have. Make a list of people you admire. Write down their top qualities, and think about the standards of behavior they hold themselves to. Now write down the standards you'd like to adopt for yourself.
It may take a few times of seeing you show up early before people realize you are now punctual, but they will start taking you more seriously immediately.
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