If you think about how you started from zero, I think that you've progressed by a little.
If you consider the fact that you started from zero, I think that you've improved by a little.
「ゼロから」→「From zero」
「成長」→「To progress, to improve」
「考える」→「To consider, to think about」
まとめて言いますと、
「If you think about how you started from zero, I think that you've progressed by a little.」
「If you consider the fact that you started from zero, I think that you've improved by a little.」
と表現できます。
どちらでも使えます。