Average Ifs with multiple criteria

Hey gus!

I am trying to find the average cost for each category under specific criteria. 

Inf_Sales_Data!B:B is the month and this should match the current month on the sheet. 

Inf_Sales_Data!AB:AB is the different categories I am looking at that are listed on a table on my sheet from A89 onwards. 

Inf_Sales_Data!T:T is the categories that include normal 1,2,3,4 and 5

Inf_Sales_Data!J:J is the cost that should be averaged. 

See my formula below: 

=AVERAGE(IFS((Inf_Sales_Data!B:B=$B$2;Inf_Sales_Data!AB:AB=A89;Inf_Sales_Data!T:T="normal";Inf_Sales_Data!J:J)+(Inf_Sales_Data!A:$A=$B$1;Inf_Sales_Data!B:B=$B$2;Inf_Sales_Data!AB:AB=A89;Inf_Sales_Data!T:T="normal 2";Inf_Sales_Data!J:J)+(Inf_Sales_Data!A:A=$B$1;Inf_Sales_Data!B:B=$B$2;Inf_Sales_Data!AB:AB=A89;Inf_Sales_Data!T:T="normal 3";Inf_Sales_Data!J:J)+(Inf_Sales_Data!A:A=$B$1;Inf_Sales_Data!B:B=$B$2;Inf_Sales_Data!AB:AB=A89;Inf_Sales_Data!T:T="short";Inf_Sales_Data!J:J)+(Inf_Sales_Data!A:A=$B$1;Inf_Sales_Data!B:B=$B$2;Inf_Sales_Data!AB:AB=A89;Inf_Sales_Data!T:T="normal 4";Inf_Sales_Data!J:J)+(Inf_Sales_Data!A:A=$B$1;Inf_Sales_Data!B:B=$B$2;Inf_Sales_Data!AB:AB=A89;Inf_Sales_Data!T:T="normal 5";Inf_Sales_Data!J:J)))

Not only does my formula return an error, but there must be a better way to do this!

I thought about listing the categories normal 1,2,3,4 and 5 in a list as {"nomal";"nomal 1";"nomal 2";"nomal 3";"nomal 4";"nomal 5"}. 

(Also please note that I am using European settings on google sheets, therefore I use the ; instead of a comma) 

I am open to any tips, thanks so much!