Redesign your about page maybe. A better design that properly highlights the segments would serve you much better. But that’s a merely cosmetic change.
If you want changes that can improve your online traffic, then look into properly optimizing the product descriptions.
For SEO you can expect anything from a $100 - $10k. It really depends on the extent of work and how fast you want to grow. You can also look into hiring freelancers (if you’re tight on budget) but before that I suggest having a free consultation call with an agency. That will give you a better understanding of what you should expect or what would work best for you.
If you need any sort of help with SEO and Affiliate marketing, you can DM me. I can take a look at your website and give you a better estimate.
If your looking for help with your marketing I can help.