Daily Mass attendance and at Stations on Fridays and any Benedictions of the Blessed Sacrament along with Fasting should be right at the top of any Roman Catholic's list for Great Lent. For us Orthodox, there is the full schedule of services and devotions throughout the weekdays of Great Lent. Participating in these devotions, along with Fasting, teaches us our Faith, transforms us and prepares us for the great day of our salvation on Pascha.
An hour in Adoration in front of the Blessed Sacrament.
A daily Rosary
Daily Liturgy of the Hours
Novena of Divine Mercy from Good Friday through Mercy Sunday
Just some additional thoughts for me.