You can create separate topic in the Games and Rounds board, this is the board for any casino to open thread for promotion.
You are free to create many threads for your promotions (1 thread for 1 promotion).
You're right, if Slotella wants to open early promotions and continue periodically maybe splitting the threads is a good option for a more focused discussion. In this section of the thread we only need to discuss about casino and gaming updates. As for the promotion review, it can be in the games & rounds section.
Since it's still early days, Slotella will have to open the thread if it wants to re-promote.