Basically I agree, but I think you can put it more simply: this is how we learn. 5 years into your career is a really short time. I know that people feel like they should be (or are) at the peak of their powers 5 years in, but that's kind of delusional.

Running a big successful project should not be your goal (IMHO) that early on. I've got a couple of very long projects under my belt (none really successful), but I've learned dramatically more from my hundreds (or thousands) of aborted projects than I have from those ones that I stuck with for 5-7 years.

Give yourself permission to play. It's important. If you have a long term, successful project, you will not have much time for play any more.