This sSummer. This Summer.

I don't remember too well, but I think this was a great season. I don't remember too well, but I think this was a great season.

I don't remember, but I think ithis was a great season. I don't remember, but I think it was a great season.

Definitely tThis summer, I improvehave definitely worked on a lot onf good habits than the othercompared to the previous ones. This summer, I have definitely worked on a lot of good habits compared to the previous ones.

We would say, "working on a habit" rather than "improving on a habit". Sort of how we would say "working on my piano playing" or "working on my writing skills".

Definitely tThis summer I definitely improved a lot on my good habits than the, compared to others. This summer I definitely improved a lot on my good habits, compared to others.

bBut I think itI was more on the side of writing down and planning it thanthings than actually doing ithem. But I think I was more on the side of writing down and planning things than actually doing them.

bBut I think it was more on the side ofdid more writing and planning it than actually doing it. But I did more writing and planning than actually doing.

To sound more natural