Building things yourself
There is a reason IKEA wants you to build your own furniture. Research suggests people who built their furniture by hand valued it more.
I connect this directly to the principle of "People over Process over Tools".
When people build a process themselves, they value it and adhere to it more. This organic ownership is always better than having a process parachuted in from the top.
Because no tool can fix what unclear ownership or a broken process cannot deliver.