Hello there,
I understand you want to send some cold outbound messages for sellers who wants to sell their properties. However, I'd like to know, if you already have a system in place to prevent your Facebook page from getting banned.
The highest numbers of Facebook groups one can join daily used to be 25, now 15, meaning you cant send 100 messages to 100 groups daily, only if you've joined the groups already.
Also, for other market place like Gumtree, do you have other list of similar marketplace in a sheet or it will just be sourced?
Also, for you to prevent your messages from going to spam, one will need to tweak the script at intervals after sending same script to atleast 4 people, if not, Facebook algorithm will flag it as Spam and it won't go through.
Lastly, I'd advise you get and use different personal Facebook accounts, that's way one can achieve sending more messages, because you will be sending friend requests to those sellers who posted in the Facebook Groups, reducing the numbers of messages that will go to spam and saving your Facebook page from risk.
I have done similar tasks and that's why I understand how these things works. I'd appreciate it if those questions can be answered.
Thanks!
Zainab