FBADtool

keyword audience insights: https://chrome.google.com/webstore/detail/precisemagnetic-for-fb-au/hoenehhlnbehnfjebchfdhalefcebjjb
shows you what you can target in fb audience insights: https://drive.google.com/drive/u/0/folders/1lIMQSmxSxZVT2NVLPz3z82nIMTI28Afm
invite post likers: https://chrome.google.com/webstore/detail/invite-post-likers-friend/iiogmgikkhnmdlplobflheeddgjnkmni?hl=en
bulk interest finder: https://chrome.google.com/webstore/detail/iinterests-interests-extr/oiafnkijemphjhikmdjfdpgcekhkibcl
build llas / custom audiences out of pages, groups, people, etc. https://leadenforce.com/
build llas out of apps: https://reach.42matters.com/
deeper keyword insights: https://enginescout.com.au/
To create free video ads on mobile use InShot - Decent quality and amazing for its price tag of $0.

Hyper targeted insights
Click laser target you'll get a list of more interests that can be narrowed down or related to your winning interest https://interests.nerdlysolutions.com/
Nerdly Solutions Facebook Audience Interests Finder
Nerdly Solutions Facebook Audience Interests Finder
Uncover thousands of Facebook interests with the click of a button. Target untapped interests that are normally hidden by Facebook themselves!

Buy facebook audiences tailored for your product like if you wanna sell a dog collar they might have a package for dog collar audiences that will be warm and ready to buy
Have not personally used it but would give it a shot https://www.ultimateaudiences.com/