i would concentrate my efforts on the areas where the efects can be compounded. in other words this involves enhancing the existing content creatiing stronger internal links within the website nd ensuring that my site serves users in ways which cannot be matched by the competitiion.SEO has many areas to work on but not every task gives the same results. If you only had one hour per day to improve a website then where would you spend that time?
Content updates, technical fixes, internal links, outreach or something else?