Only auto barrier ninja you have is Mei,and KK Gaara,so is better to play water,wind or fire.You should focus on buying Danzo,from collection scrolls,and get Iruka,hes 800 coupons in treasure of sage event(if they ever bring him back there).

Then,you c*e old blitz team,LM,Danzo,WindBlade,Iruka.

Wind,sage Naruto,Gaara,Wind blade or Kurenai.For fire,Mei,Fu Yamanaka,Kurenai,but it wont be really strong.You just need more ninjas.Try to get at least 1 event ninja,Minato Jonin or Kushina are at 12-15k coupons range,or edo Minato,Naruto 6 path,angel Konan,edo Hiruzen for 18-20k.