You have a good position 1 ninja in SOSP Naruto, but the problem is you don't have the greatest supports for him. I think your best option right now is this:

You'd have to get Gamachu for this but that shouldn't take too long if you just gather his frags from the map summon battle every day.

When the battle starts, use Iruka to interrupt an opponent setting up a barrier or shields. If there's no one to interrupt you c*e his mystery on Naruto to give him a second standard attack. Also in Round 1, put up Earth main's shields.

In Round 2, obviously use Naruto. You should have enough leftover chakra to also use Temari's mystery.

I think Temari is the best support you have for Naruto here. Gaara's mystery/barrier is too annoying to set up since it's not instant. Temari will also give everyone except Iruka shields, and buff her and Naruto's ninjutsu by 12%. But if you don't like her, here are some other options and the talents you should use if you switch her out for them.

Guy or Kurenai:

Akatsuchi:

Good luck!