Neal L. if the audience is on LinkedIn then you should go for Apollo, SalesNav (if searchable by their native filters) and push data to Clay. If you are not getting good enough results, you can try Ocean and Pandamatch for lookalike based on company domains you already have, and use keywords with this type of search, then push to Clay.
If audience is not on Linkedin, you should go for GoogleMaps scraping and push to Clay. Eric from GrowthEngineX has great content on this. This video below will answer your question π
https://youtu.be/gLIvGOWDRSw?si=e_ixlN896-wnRNQ0