When God gave the law to the Jewish people it was 50 days after Passover, thus the feast got the name Pentecost (50). Fifty days after Jesus was crucified, on Passover, there God gave us the Holy Spirit! He would write His law on our hearts instead of stone tablets. We don't need to just put more effort into following the law, we need the Holy Spirit so the law can be in our hearts!
Exodus 20:21, Ezekiel 36:26, Acts 2:3-4, 38-39
You don't need to TRY harder; you need the presence of God