In my job search I’ve been emailing many relative strangers lately. I’ve always just used “Thank you” but I’m getting tired of it. I found this helpful article. I’m probably just going to mix in “best, warm regards, and many thanks.”
https://www.forbes.com/sites/susanadams/2013/09/27/57-ways-to-sign-off-on-an-email/#4061f6cf25d0