Dear @R_X
Frankly speaking, there are myriad alternatives to Adsense for display ads. In fact, we have not run Adsense (directly) on our site in many years.
If, for example, you Google something like:
top CPM ad networks 2020
You will have enough results to boggle the mind. Here is but one example, picked at random.
Congratulate yourself if Adsense has rejected your site and go choose an ad network which accepts you! 
Cheers!
Please note that because of the global pandemic, CPM ads seems to be “in the gutter” this year; so now is really a good time to focus on developing content, apps and features for your site.
HTH