I think this question is much more complex than initially intended. I think it is more rooted in psychology and behavioral change
Right, so you want to implement new techniques into your life. Or maybe you want to change some current techniques you use. We can call these habits. To change a habit, you must change behavior. There are so many studies on behavioral modification and so many different methodologies, that's it's near impossible to source them.
You may be aware of classical conditioning to modify behavior (Pavlov's Dog). Let's say that we dismiss this as an option, due to personal preference.
We can move on to operant conditioning which is mostly the work of Skinner based on Thorndyke's Law of Effect -
responses that produce a satisfying effect in a particular situation become more likely to occur again in that situation, and responses that produce a discomforting effect become less likely to occur again in that situation
If we apply this concept to behavior modification and, in turn, to changing habits, it boils down to a simple process -
- State goal
- Monitor behavior
- Reinforce desired behavior
- Reduce incentives to perform undesirable behavior
This structure involves consistent small gains to properly and effectively modify your habits to increase productivity in the long-term.
I think the marginal gain technique is best for increasing your productivity and efficiency, as can be observed through your past experiences. Do people react positively to change, generally? What about changes that companies try to implement, are they slow or fast? Change is difficult, I'd say change is the hardest thing you'll ever do. It takes work, commitment, trial and error, and perseverance. But, nothing worth doing is easy.