>I've been on the self improvement journey for over 2 years now

My guy, self improvement is not a short exploratory venture. It's a lifelong struggle against the vices that rage against our human nature as people.

If you think 2 years could ever be enough to guarantee that you won't ever experience a momentary relapse into the life you knew before, you've been sold a lie.

What you're describing is a burst of motivation based on novelty. Now that it's gone, you aren't willing to put any effort in because you simply don't want it enough. The benefits don't seem worth the cost. When our mind sees a job that's harder than the reward appears to be worth, we feel tired. It's a physiological mechanism for saving energy. If that's what you're feeling - you need to evaluate why you want to improve in the first place. If you don't have a good reason and you don't care for it, it won't happen.

Lasting self-improvement does not come from frivolous feelings - but a foundational change in your beliefs about yourself, about life, and about what matters.