Is our capacity to practice devotional service limited by our prarabhda karma and the resulting guna configuration?

What is the role of Prarabdha karma in devotion? The configuration of our three modes is in coherence with our prarabhda karma, so how does one conquer their prarabdha so that he or she can at least begin to think about Krishna? Is not our ability to pray determined by the configuration of the modes? Similar, is not the purity of our devotion and our devotional progress linked to our prarabhda and therefore to the guna configuration?

If this is not so, why is devotion interrupted by distractions? If we say it’s our freewill, then even the freewill is not free. The freewill is also under the influence of our gunas if we end up taking a wrong turn. And if it’s guru’s and krishna’s mercy, then that mercy shouldn’t let us fall down or fall away.

Sorry, i am a bit lost. Please do shed light on these questions and doubts.