"Pursue" is maybe too strong a word, because you surely do not want your PSAs and CSAs to feel pursued. Joking aside, I think that you should contact them every week with a uplifting and positive message for at least a year, unless they block you or ask not to be contacted. Starting with a preposition that they signed up for a real reason other than just clicking, and just think of the thousands of reasons why they are inactive, I am sure that one, albeit small percent of them will become active in a due time.
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"Pursue" is maybe too strong a word, because you surely do not want your PSAs and CSAs to feel pursued. Joking aside, I think that you should contact them every week with a uplifting and positive message for at least a year, unless they block you or ask not to be contacted. Starting with a preposition that they signed up for a real reason other than just clicking, and just think of the thousands of reasons why they are inactive, I am sure that one, albeit small percent of them will become ...more