Which practice area should you actually target?
Not all of them. Firms typically list twelve practice areas and rank for none, because the site says a little about everything and enough about nothing.
Pick the two you want more of, build genuinely useful pages for those, and let the rest sit on the services list. Depth beats coverage in legal search by a wide margin — a single thorough page on separation agreements in Alberta will outrank twelve firms' family-law summary pages.
The choice should be commercial rather than sentimental. Target the work you want more of and are set up to do profitably, not the area the founding partner is fondest of.