Check that the drive belt is not damaged and tensioner works.
https://www.fix.com/models/lawn-mower/ryobi/id593720/12a-568q034/
May be the transmission but they charge a small fortune for a new one. Go to lawnmower repair place and look for a junked unit with a good tranny. Replacement is not hard.
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Not cable
follow the cable down to the transmission box and see if it is still attached, if it is the cable will need tightening,halfway down the cable you will see a couple of adjusters,open these mate to tighten the cable up
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