Good goals for leveling up?

Welcome! As a dinosaur in the community, I can only upvote your answer.

I think about things in life as either "required" or "optional". Required are the ones whose absence would hurt you, and which cannot be fully compensated by being great at something else; the archetypal example would be health. Optional are the ones that may be great to have, but you could have a fully satisfying life without them, too; the archetypal example would be playing a piano. (Of course it's not completely black and white.)

A good life would then require being good (even if not great) at the required things, and to excel at one or two of the optional ones. Because the optional ones are usually what gets you money. Health may be one of the most important things in your life, but having superior health doesn't buy you food or a place to sleep. However, being a great piano player could get you a job (traditional or not), which could pay your bills.

Going to more technical detail, the required things have a convex usefulness curve. It is much better to exercise than to not exercise at all, but you should not worry too much about having the best exercise regime in the world (unless you want to turn this into a source of income, which is in the "optional" territory). In other words, you should focus on improving the required skill you currently suck most at, because improving that one will give you most benefit. -- With the optional things it is the other way round. Being a mediocre piano player is not much better than not playing piano at all; it is a waste of time either way. Among the optional things, pick one and become great at it; and maybe have another one as a backup.

Holistic leveling up would then consist of making a list of all "required" things, evaluating sincerely how good you are at each of them, and focusing on the ones you have most neglected. Plus doing something about your selected "optional" thing.

Going too wide on the optional things... trust me, I understand the allure... but if you try writing blogs and playing a piano and learning a foreign language and studying math and coding your website and working on your novel... while you eat chocolate, drink Cola, barely go outside, and sleep 4 hours a night... you are doing it wrong. Yet it is easy to deny this wrongness by focusing on the "holistic" part of the picture ("writing and piano and languages, how richer and more balanced than those people who only play the piano!"). Gods know how much my brain tries to drag me this way.

I am saying this because I have a feeling that "writing X blogs per month" is very likely a bad goal. It feels like something that should be done -- if you are reading a community blog, it feels fair to reciprocate by writing; also, writing good articles is high-status here -- but unless you have a comparative advantage here, it is most likely not the best course of action.

Disclaimer: I don't discourage anyone from writing, just because they are not a superstar! Only from having "X blogs per month" as a goal. Do the thing that is best for you to do; and then perhaps write a report on it when you achieved progress. Just don't write instead of doing the best thing.