The three major ranking factor according to Google official is the content, links and rank brain, you know. 
Do you know what? Only quality content with proper On Page SEO with bringing you in the competition gets in Google first page, if your site has little bit authority, for many low competitive keywords it will be get ranked only with On Page SEO.
On Page SEO Audit service
Here I am offering my own On Page SEO service, if you know don’t know who am I.
It’s not really a big deal who am I, but what I am offering may important to you.
However, I follow Backlinko On Page SEO guide, so everything I will check and report what Brian Dean said. In brief, they are –
1. Keyword in Title
I will check the target keyword is available on the page title or not and also check where the keyword placed in title, at the very beginning or end.
Yes, also check the title length, is it something over 65 characters or not.
Title markup is also important, so don’t forget to check that, is it H1 or other tags.
2. Title markup
Wrapping the title with H1 tag is the best practice, so I am going to check that.
Using multiple H1 tag inside an article is not the best practice, So I will find out the pages with multiple H1 tags.
Also, I will tell you the title tag distribution throughout the article, especially using the keyword in H2 inside content.
If you are confused with ‘title tag distribution’ please ping me.
3. Keyword in URL
Is keyword in URL is also an important metric in On Page SEO. I will check it.
I will also check, how search engine friendly your URL’s are like the URL length, URL characters and strings and so on.
4. Multimedia Use
The quality images, infographics, charts, diagrams or videos improve On Page SEO score. So I will check you did it for your pages or not.
You know, the alt tag describes your image, So I will make sure you put alt tags to your images or not.
5. Keyword in the first paragraph
Some say it’s important to place your target keyword in the first 100 words but I think using the keyword in the first paragraph also enough. This is not a huge ranking factor but it’s better to use also. I will include this parameter in the audit report too.
6. External Link Check
Using relevant external links help search engines to figure out your page’s content and ranks better. There is no standard rule how much external link you should put in a page, but at least one is great. I will report you regarding this issue in detail.
7. Internal links
Doing an internal link is important, helps search engine crawlers to navigate your site entirely and helps crawlers to understand your sites topical authority. Small effort does a lot. We will report to you how sound your internal linking is.
8. Site Speed Optimization
Yes, your site speed is a ranking factor, fast loading site ranks better. Don’t frustrate that your site mobile page speed is not 100 out of 100 but less than two seconds is smart loading time. I will report your page speed in different platforms like Google Page Speed Insight, Pingdom page speed tool and also in getting metrics.
However, I am offering a dedicated page speed optimization service you could check out that too.
9. Image optimization
Optimized images help to get first loading site, so I like to send you a report regarding the optimized image. I said earlier about using alt tag in the image.
10. Content Length
The long form of content is the modern trend and also helps to rank better. I will find the thin content and will report you to update it.
11. Social Share Plugins
Social signals are the ranking factor, and the social media plugins prompt your traffic to share your content. So, it’s also a part of my audit report that you have used the social share buttons or not.
12. Page Responsiveness
You know google introduced mobile first index, and more importantly, Google started to give a penalty to mobile unfriendly pages. So a mobile-friendly responsive website is important. I will report your web pages are mobile-friendly or not.
If you have any question regarding On Page SEO Audit Service, just ping me here in my contact page or at skype: mushfiq_08
I will get back in short.