Is striving after self-improvement inherently valuable, and if so, how?

Is striving after self-improvement inherently valuable, and if so, how?

Is striving after self-improvement inherently valuable, and if so, how? Otherwise, is it merely a means to a mundane end such as money, prestige, or such? If the latter is the case, is there some reason not to be content with only moderate success and/or exertion and how would this not lead to a slippery-slope of laziness?

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