The irony is: I wrote a bunch of small custom elements [0][1] that do one thing and I don't use Lit for that, because Lit is still overhead. The litte bit of boilerplate overhead of Web Components, I simply wrote by hand.
Great idea, especially since many popular cycle tracking apps have a bad rep of sharing data eagerly with Facebook and other entities.
One thing though: I know it's popular in these apps to show the cycle as a "clock face", but if you think about it, this is a weird representation, because of the variations in cycle lengths (of natural cycles not changed by contraceptive hormones). So, if one cycle is 26 days long and the next cycle is going to be 30 days long, the clock face will show an average of 26 days for the next cycle and the handle looks stuck "5 minutes before 12" and every day, the handle doesn't tick one further, but the unit (day) becomes more compressed.
This makes comparing cycles unintuitive and suggests that natural cycles always have the same length. In reality, the majority of women have fluctuations of 8 days or more in their cycle's lengths per year.
From what I heard, most people feel regret at their deathbed for working too much, not the other way around. While you seem to have noble motives, I think many jobs out there don't provide much value and don't advance society as a whole. Think about large parts of the entire financial industry. Yes, the financial industry is important for a stable economy and a high standard of living, but there's a substantial amount of jobs that don't do much but redistribute wealth between individuals. It's really silly.
The biggest question is: What do you want from life? And one way to find out is if you answer the question:"Would you be doing the same if money wasn't an issue?". I think contributing to society through work is hard to define and overrated. Do you think all these silly apps make a difference on the grand scheme of things? Probably not. Does society really need smartphones? It all depends on you and your own values. If you do things that bring you joy, you might be doing more for a healthy society than if you create value through some job that you wouldn't do if money wasn't an issue.
Edit: I started to read this blog recently, which tries to answer what makes a life a good life. Maybe, you'll find some inspiration in there: http://earlyretirementextreme.com/