500k installs but no revenue

heelloo guys i have this huge issue :frowning:
a long time ago admob desativated ads in one of my androd apps i made an update,but ads worked for one more week and then be desactivated for like 6months now . when i checked that app yesterday and i found that it reached 500k installs :eek:
what do u suggest guys to make another update or change the adnetwork
what ur suggestions
thank u guys :o