I think combining being realistic (for the sake of sanity) with being ambitious (for the sake of going beyond the average) is a good hotspot.

For one, it avoids the psychological traps of frustration if you keep it realistic.

The other good thing is you will not sit down complaining andnyou will put your time on something that is worth.

You can fail or succeed, but with that mindset I think things go, at least, psychologically better.

I am not convinced at all that becoming just comfy and a conformist in itself is more healthy.