Need to further automate an Excel formula

Hello and thank you in advance. I am using Office 365 and here is the formula which needs more work. I need two things added to it. If you click on the image it will grow larger.

1. I need to wrap it in  ISERROR like as follows - =ISERROR(the formula below), "There are no Area One accounts requiring deactivation this month"). I've tried this and I get an error message which says I have too many arguments. How do I fix it?

2. I need to change these sections (Data!I5:I144<40000)*(Data!J5:J144<40000)*(Data!K5:K144<40000)*(Data!L5:L144<40000) as they are pointing at specific columns and I need them to update as the year goes on. For example, in May I get revenue data on the past four months Jan-April. In June I get it for the past five months Jan-May, etc. I need this section to update as the column headers in F6:I6 update. The column headers there use a simple formula like =TEXT(EDATE(TODAY(),-1),"Mmm")  which returns April in cell I6. H6 shows =TEXT(EDATE(TODAY(),-2),"Mmm") and etc. I need the formula to update to pull data from the correct column to match the month in the column headers. Does this make sense?

Thanks again for any help!