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There is nothing you can do to force adverts to appear in your game @roo5
If you have lost them after making a purchase with real money then you will not see them again for at least a year, but there is a chance you will never see them again.
If you haven't made a purchase, but your adverts have stopped working then this is normal as well. Sometimes the adverts will come back after a short time, but sometimes they never come back.
I once lost my adverts for seven months