You might have better success using Adsense's Auto Ads.
Inserting ad in the sidebar will be pointless, since that ad will only show on the homepage. No point in that. Instead, test Auto Ads. Add your code in the HEADER section, and Adsense will insert ads on it's own. So you'll have more ads, more opportunities for revenue. But it can have unexpected results. So test it and see where ads will show up.