The most important thing you can do to optimize your website is to write lots of relevant and rich text for each page.
A lot of text is good for getting high on searches on Google. Then there will be more searches that hit some of the content on your website. But, at the same time, the text must be relevant in terms of what the page is about.
When writing text for a page on your website, choose a keyword that clearly expresses the message of the page, and then write the rest of the text around that word. Repeat it in the text here and there, but no more than 5 times.
Write as easily and freely as you can. Remember that you are writing about something you CAN, about your own company and the services you provide. Write as if you are the expert in the field. If it benefits visitors, post useful links to other websites that may provide additional information to what you are writing about.
Imagine that you are writing to someone special, and write YOU and YOURS instead of MAN and ONE. Then you give visitors the feeling that you are writing directly to them and not in general to everyone and everyone.
If it's hard to figure out what to write about, check out what other websites that are doing the same thing as you are writing. It can give you useful tips and help you get back on track.