I sell a ton of stuff on Marketplace --- it can be a good gig as long as you know how to source product for cheap. I fund lots of toys that way. That said, if you don't have a dedicated source of products 9k is a tough number IMHO. A couple tips to help succeed though:
1. Always list 10-20% higher than you want. You'll be surprised at how many people will pay over your ask, and for those that want to haggle you can let them get down to your target number.
2. If you sell something, wait a week and then delete it. The facebook algorithm seems to give the rest of your listings a pop after you clean house (maybe because it shows you're active?) so that helps move things.
3. Remember that your gas is worth something. If it's a small item make the people come to you. If it's a large thing factor in gas and then quote a radius you'll meet up in. Same applies to time.
4. My standard disclaimer on listings is "no cash, first come first served, and not looking for trades. Meet up is at _____ (address here)." And then when the inevitable questions about those things come, I say "that information is posted in the ad" because if they can't read it I don't want them bugging me.
5. If it has a serial number, take a picture of that and hold it for a few weeks just in case.
6. FB uses AI to screen against bad things like "knives", "guns" and anything of the sort, and they will delete your profile if you get enough strikes against you.
7. I don't have a personal FB, I just made one exclusively for Marketplace. If you do that to keep things separate then know you're limited in listings for a while.
8. Always leave feedback and it's okay to request that. More feedback means more visibility.
9. If you want to ignore point 1 and list 30-40% high for a week before getting down to business do that and then drop to the 20% level. Then FB will show you reduced it. Marketplace people do a sharks in the water thing where they often seem to see that and think "well he has to get rid of it, let me go for it and ask for another couple bucks off". End result is you still come out ahead of what you wanted.