Is there a trick to hearing the difference between 'o' and 'ọ' in rapid speech?

I've been learning for a few months, but I feel like I've hit a wall. When I listen to native speakers, my ears can't distinguish the open 'ọ' from the closed 'o' fast enough, and I end up freezing during conversations. I’m skeptical of apps that just focus on word lists—does anyone have a method that prioritizes active listening and output over just staring at flashcards? I am asking specifically about learning Yoruba, not a generic study routine.