Send short messages to the leaders to express their ideas. (high score)

XXX (your respectful name), are you busy recently? I'm glad to hear that you have mentioned me a lot recently. I'm defending my graduation thesis now, so I haven't contacted you during this time. In fact, in this internship, I cherish my work experience with you, because I have gained a lot. . . (a few gains).

Then, if you like, talk about your plan, or express your willingness to go back after your defense. Colleagues will also sound out whether his idea is willing to let you sign a contract or something.

It's simpler. Why do you think so much?