Hi there,

it depends on what your end goal is. Are you looking for page likes or you want to send traffic to a landing page on your website in order to get leads or sales?

If you can give more clarity on what your business is about and what you are trying to achieve, then I'll be able to give you pointers on what to do to increase your ROI.

For now all I can say is work on your Ad copy (not so much about trying different images, but images that send the right message). Hone in on your targeting... test, test, and test, until you get it right!

Feel free to contact me if you need to talk further.

This strongly depends on what product you're targeting, what market you're in, and countries you're after. Also, is it an online product or a physical product? How long are you running the ads for? Usually a good 2 weeks is fine, then the results decline. It would be great to know a bit more details about what exactly you've done and then figure out with you where exactly the problem is.