I’d like an explanation of what you actually mean by this and why not voting is better than voting for the least bad candidate, if you regard them all as bad.
It is not. You need to re-familiarize yourself with what monarchy actually is. Maybe spend a year in an actual monarchy/dictatorship country if you have so little appreciation for the democracy you currently enjoy?
Monarchy is rule by means of individuals whose positions cannot change. That roughly describes the US. There's so much imbalance and indecision and so much of the power where it shouldn't be that it's de facto no different from choosing between two lineages every four years, only to get screwed over each time by several of the promises being a sham. There are other proclaimed democracies that are truer to their word.
It really isn't. It does require some basic engagement and research. Maybe 10-15 minutes max if you don't care to get too in-depth. You can always skip ballot measures - they are more time-consuming, for sure.
So it doesn’t bother you there are only two choices every four years?
Of course it bothers me. Which is why I donate to and help with the campaigns for progressive candidates. But our political system is not going to change any time soon and throwing up your hands because the choices aren't perfect is counter-productive. If you do that, you end up with LESS choice. By voting and voting consistently you open the door, even if it's just a crack, for more progressive choices. By not voting you ensure that we continue to be stuck with two bad choices.
Real progress has been made. And the real enemy of that progress is apathy.
As opposed to better ones? The system we have is one that has been overridden by normalized acceptance of a tiny pool of people not even good for the work.