First of all, I would like to say 'yes' and I would give you the reasons. It is important that you acknowledge an affiliate after a long period of inactivity for the following reasons:
Most affiliates do not come back after leaving. He might have left due to personal reasons which you may not know. Acknowledging him/her makes him/her feel important to your team.
If he/she is active again and continues working in SFI, you are going to earn from him.
What I think you should say:
You could send him/her an e-card to welcome him/her back and tell him/her that you are happy he/she is back and you believe he/she is going to be successful in SFI and he/she is not going to leave again.
I wish you success.
Best regards.
You could also initiate a chat with him if you see him online and ask him/her why he/she was inactive.
You could send him/her an e-mail to tell him/her about the new games in SFI and remind him/her of some of the basics things in SFI. Encourage him/her and tell him/her you would like to hear from him/her and tell him to feel free to contact you if he/she needs help.
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First of all, I would like to say 'yes' and I would give you the reasons. It is important that you acknowledge an affiliate after a long period of inactivity for the following reasons:
Most affiliates do not come back after leaving. He might have left due to personal reasons which you may not know. Acknowledging him/her makes him/her feel important to your team.
If he/she is active again and continues working in SFI, you are going to earn from him.