First define what you mean by boosting + your goal of boosting.

For example, if you're running paid traffic to your agency home page, consider if this is useful (monetizes).

Likely best to "boost" (I'm guessing you mean running traffic to) artist pages + then have artist pages point to a category (containing related artists) + have category pages reference your home page.

Google the term siloing for more information about various silo strategies.

Start with how you expect to monetize your efforts + design your site silo.