Distinct count customers' future bookings

Hello everyone.

I am trying to create a dax formula, for a table which will count how many customers from the previous year, have bought the same product from the same store, in any future period starting from the 1st of January of each year.

The table has the following columns: Store, product, year, dax formula calculating the above. I have tried to create two filtered tables and intersect them which works but is not efficient at all. I would appreciate any help.

Thank you.