What to focus on in lessons?

Been playing trombone for over 5 years and I plan on playing for more. I’ve been offered to get lessons from my brass tech for free but I really don’t know what I should focus on. For me there’s a whole laundry list of things I would like to focus on but I feel like focusing on all of them at once isn’t the move. Should I go with that route or focus on only a couple things.