I would say it is possible to Sin No More, however very difficult…
…not committing acts of mortal sin is probably an easier, although still challenging goal for a good Catholic or any good Christian, as one progresses in his or her journey of holiness it is certainly possible to attain the ability to avoid mortal sin altogether, again I still think this is challenging, yet possible for many…
…however to never sin any more (or perhaps a better way to put it, to not continue commit sin anymore, acknowledging that we/they or whoever had sinned in the past, yet continuing through this life without sinning again), whatsoever even venial sins, this is a task I believe that perhaps some saints have achieved, yet many of us laypeople may struggle our whole lives and not achieve…
…that does not mean we shouldn’t try
…
…that’s my two cents anyhow.
Praying for you @jredden92, please pray for me.