>>11Well Anon.
If I can dare an hypothesis, it seems that after you have reached some important life goals (the cozy house, the well paid job) your mind simply got in rest mode.
In other words, you may not have anymore that hunger that pushed you ahead.
My suggestions are:
1. Accelerate
Hedonistic lifestyle is wrong, we all agree about this but your subconscious mind still needs to understand it.
Therefore my advice is to put aside your guilt complex and indulge in every pleasure you want. Tell to yourself that you are taking a vacation from yourself.
The objective is to feel the disgust for the pleasure as end of itself.
When the things that you feel alluring and addicting will turn to be boring and unappealing, you'll be ready for phase 2.
2. Remotivation
As you said. You have achieved some major life goals. You need to find another one to pursue.
I remember that when I was in the same situation I got involved with politics but you must find your way by yourself according your personal inclination.