Where is the nearest non-earth life located?
On Mars. You will find it soon.
Actually looking at the structure of your system, we were sure that you are all long dead expect simplest forms like on Mars. Because there was a huge event in the past, a massive body has entered your system and swapped the planets, moving small ones closer to the star, and moving huge planets to the outer. But looks like it happened before you have emerged.
This mean that usual planets in habitability zones are larger than Earth. Imagine how the life might look there.