I continue to pray the 'prayer of Jesus', each day, and many times. If I wake up in the night, the first thing I do is inhale ... 'Lord Jesus Christ, son of man, son of David' then exhale ... 'have mercy on me a sinner.' I find it an excellent discipline and a great opening to any kind of spontaneous prayer.
Also, as I have been praying for mercy I have become more aware of my own sin and shortcomings. But the great news is, I have become more aware of the depth of mercy and grace that Jesus brings and gives.