A message (and reminder to self) to all my mid-career friends in similar situations:
When I was early on in my career I did many free speaking gigs and projects that were additional to the requirements of my job. This was good! I was new, I was building up my credentials and expertise, and my reputation. For certain causes and groups I still work for free and of course certain events are within of my regular salary and work.
More broadly though, the most important thing that I’ve taken out of the last 2 to 3 years, and a phrase I want us all to practice saying is “I can’t do this unless there is compensation for the additional hours.”
Or, if you don’t actually want to do it, don’t.