Google PageRank is outdated, while DA and PA is just a assumption calculation based certain metrics, it's NOT official from Google and is not SEO factors.
If you are referring to your own website, then is Google Analytics. For other's websites, Similarweb.com is a free tool to check (sometimes is not accurate though). Paid one you can try compete.com or semrush.
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Hi, here're some of the tactics to improve your website SEO:
1. Keyword Research
2. Use LSI Keywords
3. Use Long-tail Keyword
4. Optimize Your URL Structure
5. Optimize Your Title Tag
6. Use H1 Tag For Your Page Title
7. Use Modifiers For Your Title
8. Use Subheadings
9. Use H2 Tag For Your...
I think get a better hosting is the best way to reduce your site loading speed significantly. Next is install a caching plugin and optimize your site images.
There are many ways to improve website speed, like get a better hosting, optimize your site images, reduce javascripts usage, reduce unnecessary plugins, and etc.
CTR is stand for Click-Through-Rate. To improve it, make sure your headline and description are attractive and irresistible for users to not click on it.
Give proper meta tag like title tag, description tag, and alt tag on images. Don't use flash, use XML sitemap for search engines, and make sure you site load fast.