nice to see u, to develop speaking first of all practice every day to speak at least 1 hour.
nowadays there are tremendous apps to develop speaking bcoz in, the digital era, students are shifted to blended learning so they are ready to learn through digital mode. the learning also will be effective one
I suggest drawing inspiration from the CAE speaking exam and accustom the exercises to your target group. You can make use of picture descriptions, treating controversial topics, group debates, and roleplay.