It frequently seems like every new client wants a list of quick wins at the start of the project but they have already done most of the quick wins. They have content, they have page titles that don’t make me shudder, key pages are well linked to internally, their URLs are clean, and they’ve canonicalized the www and non-www version of their site. The good news is there is still a lot on the table; the bad news is that these things can be easy to overlook. If you can do any of the following, you can give your client some quick wins in the holiday season and make them stoked.
301 your cannibalizing/competitive pages
If you have multiple pages targeting the same term, which invariably happens as you grow, you’re splitting your link equity between pages and rolling the dice trying to get the proper page to rank. You should know what pages you have, but if you’re a bit lost, do a site: search for the primary keywords.