If Lan Wangji only has his guqin with him, this seems to be a nice time to play a slow song to lull their minds and serenade him, especially on an afternoon like this one. Except for his sword and his instrument is not with him and his power is sealed too.

Sitting on the chair next to him, by his side as he sleeps and taking a rest, he'll simply bask in the sun and meditation as if he's meditating on a beach, focusing on his own energy and connect to his golden core.