1) To run a targeted FB campaign for 'Page Likes' and then retarget everyone who liked my page with a free lead magnet and then retarget those people with an offer and keep cycling and scaling.
2) Run an engagement campaign with a video or image and then retarget those people who engaged with a free lead magnet and then retarget again with an offer and keep cycling and scaling.
3) Run a conversion or an engagement campaign with a free lead magnet and retarget them with an offer and keep cycling and scaling.
Which one is better? Personally i think page likes are solid if you want to play this game long term because you are building your own brand and page likes act as a social proof but on the other hand i think less people would like my page than engage with my post.
Also i think option 3) is the best but then i am skipping that initial warming up and offering them my lead magnet right off the bat.