Writing a genuinely unique, relevant title for every page is a manageable task even on a moderately sized site, and it's one of the highest-leverage on-page fixes available.
Work Through Your Pages Systematically
Rather than tackling this randomly, work through a full list of your pages so nothing gets missed.
Prioritize Your Highest-Traffic Pages First
If time is limited, focus first on the pages that already receive meaningful traffic or have the most potential to.
Avoid Reusing the Same Template Word for Word
A title template is a fine starting point, but each page's title should feel specific to that page, not identical apart from one swapped word.
Next step: Use the SEO Audit to see which pages currently have missing or duplicate titles worth prioritizing.