On Amikumu (or a Discord server with a voice channel), ask an Esperanto speaker for a fifteen-minute call this week, and hold it in Esperanto. Prepare three questions in advance and keep 'Bonvolu ripeti' and 'Pli malrapide, mi petas' ready. Afterwards, note one thing you could not say.

Your partner is a learner too, so mistakes are expected on both sides. Ten minutes of real conversation teaches more than an hour of worrying about it.