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Do not be cowardly towards your actions! Do not abandon them after the event!—Remorse is indecent.*
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The goal is to act in a way as not to be never remorseful of your actions. Improve everyday, step by step. Improvement and getting closer to your best self takes time and there are many setbacks, yet it is a worthwhile endeavor. As a set back may get you down, major jumps up can also not be good because in the universe for every action there is an equal and opposite reaction.
Remorse is sometimes healthy you cannot take the narcissistic route and think that you are perfect so no remorse is needed and regret but the key is to learn from your mistakes.