HI guys,
I typically boost my Fb posts for ca. 2 weeks until they get a negative ROI.
Do you guys think it makes sense for me to restart these campaigns again after a certain time frame (if yes, how long should I wait?)
In which way should I start them again: Should I make a new post with the same content (copy & past with the same picture) and then create a new campaign for that post, or should I create a new campaign for the old post, or should I simply re-activate the campaign for a few days and see if it achieves a positive ROI again?
Best
I think its better to create a new campaign with the same targeting and see if it works. There has been times where I've targeted a small demo and after a day of heavy spend the next day starts dying down. I wait 2 weeks, create the same ads again and it works.
The answer here is, like in many cases, test it out. 
Thanks buddy, looks the same for me so far.