You should always be testing different formats of AdSense ads. Also, test your keyword density. What is your niche, by the way?
You should have a website with valuable content and traffic. You always try to give valuable information about the services which your site is providing. Place google ads at the suitable place into your site. Thanks NV Marketer
You can't just get more earnings, because of ad placement. You need visitors, pageviews, impressions, clicks and many other factors. work on getting traffic to your site.
I suppose you have used 2 Google Ads side by side. Just check whether it is OK to use in such format. Regarding improvement in Adsense income, you need to concentrate on traffic.
keep your content updated. increase search engine visibility increase traffic get quality content Make the right placements of Ads