Mawlana Hazar Imam in his interview with Henry Weill from La Cohorte on 29 January 2019 said:
No, we do not proselytize. We could, but we don't feel the need. There are certain religions where proselytizing is recommended. We however, take the attitude that everyone should do whatever they want. If they want to become a Shia, they can become a Shia, if they want to become a Shia Ismaili, they can become a Shia Ismaili.
Reference: https://www.akdn.org/speech/his-highness-aga-khan/his-highness-aga-khans-interview-henri-weill-la-cohorte