 I have a few tips for you, diatonic thirds in the scale you're in, so if it's F major and you go from a rather boring F major like that to try out these two cadences, the plagal 4 to 1, authentic perfect, which is 5 to 1, keep the root the same, retaining the postinato flavour by sliding and adding some grace notes here and there, you could also take a simple triad and maybe consider adding notes to the chord, playing some 7s, maybe adding some 9s, extensions, all the best with the lesson, have fun.