ISFILTERED, HASONEFILTER and Visual Filters

Hello There;

Would truely appreciate your insight on my code below and how i can accomodate ISFILTERED ..

Lost Sales = IF(OR(Leads[Lead Status]="7-LOST SALE",Leads[Lead Status]="X"),IF(AND(COUNTROWS(FILTER(Leads,[Sold T]=EARLIER(Leads[Customer ID]) && [Year]=EARLIER(Leads[Year]) && [New/Used]=EARLIER(Leads[New/Used]) && [Brand]=EARLIER(Leads[Brand]) ))<1,COUNTROWS(FILTER(Leads,[Open]=EARLIER(Leads[Customer ID]) && [Year]=EARLIER(Leads[Year]) && [New/Used]=EARLIER(Leads[New/Used]) && [Brand]=EARLIER(Leads[Brand])))<1),[Customer ID],0),0)

Basically I am Filtering out the [Sold T] & [Year] & [New/Used] & [Brand] Column while checking if the [Customer ID] fits the criteria.

I want to use ISFILTERED as a function to check that these filters apply only when the data on each column had been applied.

So if the [Year] is filtered then only the year filter would apply, else not ...

Then if the [Year} & [Brand] are filtered then both Filters would apply and so on ...

Thank you in Advance for reading my post.