One of my favorite mindsets or habits to implement is also one of the most simple:
Do favors for your future self.
How many favors has your past self done for you recently?
We blow things off for later as if it will be someone else entirely who must eventually bare that responsibility. Naturally, time passes, and we get struck with the reality that it is in fact us who must do the thing.
Just do the thing now. Your future self will be thrilled. You guys should be friends; you’re more alike than you think.