What do you want to be like? What kind of day would you think was a good one? (here you can include things like "think silently, with no distractions, for 30 minutes" - NOT things like "have 3 good ideas"; also things like "End each day by listing 3 things I want to do the next day, and make sure they get done", rather than "Get lots of stuff done - be incredibly productive")
Design an ideal day. Better yet, design the day you want your 27 year old self to have. Now, you know what your 27 year old self does with his time. You've got 2 years to become that guy.
This means you make gradual changes to your habits. The 30 day method works well for people. Pick one of these new habits that you're aiming to have - only one, seriously - and stick with it for 30 days. Then keep that one going, and add a new one.
If you can do that, you can introduce 12 new habits in one year, and 24 in two years. That's an enormous difference, and it's entirely achievable. Three steps:
1. List the habits your 27 (or 26) year old self has.
2. Pick one for August (but you can start early this month). Do it for the whole month and start a new one in addition in September.
3. That's it. And I don't mean that I'm done. I mean you're done. Stop looking for advice. Don't read productivity blogs. Don't ask any more forums for help. Don't try and perfect this system. It's not perfect, but it's good enough, and doing the good enough beats reading about the perfect. So just do it.
And come back and tell us how you're doing!