I've just done the same (thought not 15 years in), and here are some of the things I've been thinking through that may be help you.<p>This is an opportunity to change the things you didn't like about yourself in your previous role, and reinforce the things you did. I never took vacations. I had a reputation for always being available on Slack, no matter the day, or the first person on an incident call. Those things are still important to me, but work/life balance is, too, and with no reputation, I can be whoever I want to be. I want to be quick to respond, but only when a system tells me I need to, not because I'm trolling Slack on the couch at 8pm.<p>Ask a lot of questions. You know enough to be hired, but nothing about the new place, so ask! Give your new peers opportunities to be experts, and eventually they will do the same to you.<p>Try not to live in the past. This is a place I could use work myself. Rely on the things you've learned, but realize the situation is different, and if you compare now to then, you'll be disappointed. Remember, it took 15 years to get to "then." There is a possibility that it was more than just time, but it will take time to figure that out.<p>Assuming best intentions, you got to the place you are by being yourself. So, do it again. Rely on your instincts. Look at the world as a recent grad starting their new job, and do it again. You think you forgot how to do it, but maybe you never really knew "how" before, you just did it. If you did it once, you can probably do it again.