Greetings xxx. I hope you are having a good day. 
Please pardon me for contacting you once more, but I wanted to ask whether you are still open to continuing our conversation. 
I wrote to you earlier, but since I have not received a reply, I am not sure if my message was delivered. I understand that there may be many reasons why you have not responded. It is possible that my nationality or my location was not what you expected, or perhaps something I wrote in my previous letter was misunderstood. If that is the case, I am genuinely sorry. 
I would be appreciative if you could let me know whether you would like to continue our communication. If you are not interested, I will respect that. And if I do not receive a reply, I will not bother you again. 
Thank you for your time, and please forgive me if my message troubled you in any way.

Kind regards, Nina