I would say carving out the time (and now fuel budget) for getting to a test range. I have to make arraignments to get a weekend off. In the 60's, I could literally walk 5 minutes from my house and fly all day. Developers and population pressure now make this a dedicated trip due to distances. The suppliers we have available now provide a much wider range of dedicated products ( now 3d printing has grown up) than we ever had before. Yes, costs are going up as they always do. Somehow I could afford to fly making 1.25/hr. Someone else is always going to have that unlimited checkbook, so I try to maintain a little sanity, but I'm still crazy around the edges. When my wife saw a check Scotty Bartel handed to Eric Gates (R.I.P. buddy, thanks for the certs) for two motors back in the day that was more than our mortgage, she put her foot down hard. "You are NOT going to do that to us, and you know I love you". Thus the promise to this day of never going to level 3. Yes, I could afford it easily now, but a promise is a promise. If luck holds, maybe I can fly a couple more years, it's getting too hard on the old airframe for, well, everything.