Unity Ads have finally admitted there is a problem
Note this line - The Legacy Unity Ads SDK no longer receives regular updates, and as such, the long-term path for all legacy Unity Ads users should be to migrate to LevelPlay.
Does the Unity Ads plugin support LevelPlay or can it be updated? Or is a new plugin required.
I believe unity levelplay is completely different than unity ads. Levelplay is a mediation system that can support multiple ads network (such as ironsource ads, unity ads, admob, applovin, and many more), while unity ads is just one ad network.
Slightly off-topic: I personally started using Solar2D native so that I can implement the whole levelplay apis myself for my app (or any other apis). It took me around 30hr of work for ios version, including setting up a solar2d native project for the game, all the xcode settings issues, downloading levelplay sdk, levelplay dashboard setting, ad network registration, writing obj-c bridge code, and finally calling from the game in lua to make it work. I had no prior knowledge of xcode or native project or ad networks, and I thoroughly used AI. Without AI, I probably could never manage to make it work. It will probably take me similar time for android version again.