The attribution model that should be used to accomplish the goal will be the linear attribution model.
Linear attribution is a multi-touch attribution model which splits conversion credit equally across each touchpoint or interaction along a customers journey. Simply, this attribution model gives a participation award to every marketing channel a business used.
Unlike attribution models in single touch attribution, Linear attribution is apart of the multi-touch attribution model and gives users a balanced look at the whole marketing strategy rather than one single-event.