'Immigration lawyer Louisville' is one query in a market that asks fifty questions
The head term is the smallest and most expensive slice of the demand you can actually reach.
Head terms pull in everyone at once: people who want a form, people who want free help, people price shopping three firms in an afternoon. The firms sitting on top of those results have usually been publishing for years and are buying the ads above them as well.
Underneath sits the demand that converts. Someone types a description of their own trouble. My husband was picked up at work. My green card expired while I was overseas. My employer says my paperwork runs out in April. Those searches are longer, quieter, and far easier to answer honestly than a head term ever is.
Build the site as a set of situation pages, one for each problem you take, written in the words a client uses instead of the words in the statute. Put the form number in as a secondary reference, never as the headline.
The head term deserves a page. It does not deserve your first year.