Oh.
That's easy.
Tweak your logic like I had to a while back to realize that there is no "top of the mountain" and going down is almost always a choice.
In my own field,... even if I start my own business,... it's not the top,.. cause now I'm competing with other businesses for a niche in the market.
If I become the leader in town,.. there is still state,.. then national, then worldwide.
And that would only be in one thing.
I guess I'm saying two things here:
one - Decide.
two - Do.
Let "happy" take care of itself.
(it usually comes after those lazy slugs contentment and satisfaction.)
Don't look for it. If it hits you between the eyes,.. gently remove it and take a good look at where you are at that moment.
If you want more,....worry about the good feelings on the weekends and just take note that you're feeling pretty good. See the new better apartment as the stepping stone to a house,.. See the success of the relationship as the first round,....(chuckle),.. see that promotion as validation that you have a clue and keep going.
If you are "happy" where you are at in any of the things you mentioned,... Don't relax what got you there,... but relax everything else and "check the fit."
If there is no pinching or binding,.. or you find that it's not too loose a place to be - then you can let yourself admit that this is "happiness."
I admit that the above is REAL general,... and nothing is foolproof,.. but the folk who live longest and enjoy doing it appear to run in that mindset.
V.