It depends on where your website is today and what you’re trying to improve.
For example, if you don’t know why your website isn’t performing well in search, an SEO website audit can be a good starting point.
If you’re unsure what your customers are searching for, you may need keyword research. If your pages already exist but aren’t well optimized, on-page SEO may be the priority.
For websites with crawling, indexing, speed, or other technical problems, technical SEO may be needed.
Instead of recommending the same SEO package to every business, I prefer to understand the problem first and then recommend the work that makes sense.