system
Given the following post, respond as if you're commenting on Reddit:
human
When to give a thank you letter to a professor/advisor?

I'm in a somewhat unusual circumstance where I am going into a master's program at my current university, and have already built a good relationship with my future (current?) advisor. I am finishing up my undergrad right now. I have had several classes with them, and they have asked to collaborate on a small project over the summer. I'm very happy!

But, I want to thank them somehow. They have been very influential in me choosing my field of study and future, and I want to communicate that. Of course, a thank you note is obvious, but I thought it might be weird to send one right now, at the end of undergrad, when I am going to be in contact with them over the summer, and will have plenty of contact with them in the coming years. I'm looking for validation on whether or not it would be weird to give one at this time.

I'm probably overthinking this, but I wanted to hear other opinions. My friends all said it would be weird, but damnit, I want my prof to know how much they influenced me! It wouldn't be anything extreme.
gpt
You can write a letter to the administration telling them what an exceptional Professor this individual is and all that they've done for you. Sometimes people submit them to the department head sometimes they submitted directly to the dean. These sorts of letters do get noticed and recognized.