1. comparing myself with five years ago, I am now a changed person.
How about "comparing myself with five years ago to now, I am a changed person."
2. but feel grateful with (for) what I do have.
3. on a fast track in getting... - on a fast track to getting...
4. I no longer mouthing along - I no longer mouth along
5. I have a new home and working - I have a new home and am working
6. 覺得 evolving 用得不太合適, 用 expanding 較好