Designing a project is essential.
Rich Armstrong who describes himself as a multi-hyphenate artist and career coach has written a book about designing the perfect 100 Day Project.
More tips for creating a successful 100 Day Project:
https://craftindustryalliance.org/tips-and-tools-for-creating-a-successful-100-day-project/
https://designobserver.com/five-years-of-100-days/
I'm frankly surprised that the 100 Day Project is not embraced more by public libraries. One library that does a 100 day project is the Daniel Boone Regional Library. Kudos to them.
Suleika Jaouad explains how the 100 Day Project helped her during a particular low point in her life in The Book of Alchemy.
https://medium.com/@chantal.walvoord