You should examine the pages' loading times because they may have an impact on their ranking and bounce rate.

Hi dear, if your website is not working well even after so much hard work, you should see if there aren't technical glitches with the website. see if your website is following all the google algorithms norms. And yes SEO is a time taking process so be relaxed and be consistent with your work.

Well for google the content mean more than the High DA/DR or PA of a website. If your website has a high matrix but the content is very low quality then google will never show it in SERP.

The re-direction to the home page option looks more promising.

I think you should update your content with new keyword because the positions of keywords keep changing as new content is constantly uploaded on the browser.