, you may consider Catholic ejaculations, which are brief prayers, usually one liners, prayed to invoke, resist temptation, or simply an expression joy or sorrow of something one has just experienced.
My Grandmother on my father’s side used to pray/say them several times a day. For example, when family arrived at Christmas dinner for the family, if someone carried in a baby, she would hold her/him and say “Sweet Jesus, Mary, and Joseph ! Bless this beautiful child !”
Here are some that pertain to the invocation of the Sacred Heart:
May THE Sacred Heart of Jesus be loved in every place.
Sweet Heart of my Jesus, grant that I may ever love Thee more.
Heart of Jesus, I put my trust in Thee!
Sacred Heart of Jesus, Thy kingdom come!
Divine Heart of Jesus, convert sinners, save the dying, deliver the holy souls in purgatory.
Sacred Heart of Jesus, I believe in Thy love for me.
Sweet Heart of Jesus, have mercy on us and on our erring brethren.
All for Thee, Most Sacred Heart of Jesus.
Sacred Heart of Jesus, mayest Thou be known, loved and imitated!
Sacred Heart of Jesus, protect our families.
Sacred Heart of Jesus, I give myself to Thee through Mary.
Sacred Heart of Jesus, convert all poor blasphemers!
Each line is a single prayer/ejaculation. Your ADHD shouldn’t hinder memorizing a couple of your fav’s if you chose to

My favorite is “My Lord, my God, my All, have mercy on me”
Some of the traditional ones carry indulgences, but you make come up with your own.
My own devotion, first and foremost is to The Blessed Virgin. Usually an Our Father followed by " My Lord, my God, my All, if it be Thy will, accept the intercession of the Blessed Virgin as she places my prayers before Thee". Then I’ll ask her intercession.