How to counter 3N-2W-2-1-2?

How to counter 3N-2W-2-1-2?

Narrow diamond

My brother played vs this a week ago. I joined the game after 30 mins and he was 1-0 down so I changed so a strange 4-2mc-2amc-2st. Notonly did I draw 1-1 but we had better stats and more chances despite being ranked 6% lower overall