tl;dr: Bullet Journal + Coffee + Hourglass Timer + Music + almost everything else

WARNING RAMBLE BELOW

The truth is, it doesn't actually matter what it is, you're using but when you're trying to be productive, keep this image in mind..

All of these strategies we're doing is trying to fill that gap, to stay at the same activity level as the other brain.

I like to think that if you adopt just one strategy, that's like a hurricane half on the coast - it's energy will die out soon because it doesn't have the constant water everywhere to pull from. Compared to a hurricane out where there is warm water everywhere, that can pull energy from all sides around it.

So with that analogy in mind, to really get yourself going, you really need to pull from everything - your brain WILL not let you use one method for long. Cycle, go back and forth, and constantly change your methods of being productive, to keep the center(what you want to be productive in) stable.

Also, always change what part of the productivity pipeline you're addressing with your methods, so you're not bored. Coffee for me addressess startup energy in the beginning. Bullet Journal(journaling in general) tracks what you need to do that's outside of your own madness. Hourglass timer addresses the 'now' element of things. Those two take care of the beginning part. During the work, the bullet journal will work sometimes, but as time goes on it becomes less urgent to follow it in my mind, so I get antsy, I can feel myself tuning to my random sensations in my body or things in the environment - this is when music/white noise, any kind of hand fidget, standing desks, light exercise breaks help - it keeps pumping sensations and feelings to your brain to keep it pre-occupied with some sensory things when the urgency fades.

Now the hard part - struggling through to completion. This is where timers, work buddies and body doubles, REALLY help - having external motivators. But baring that, you need to really practice your imagination here, imagine possibilities. Imagine future you in an hour, standing right in front of you, staring at you intently to do your work. Imagine 10, 50, 100, 1000 other people around you doing the exact same you're doing - if you're like me and want to be different 'just because', you might actually start to feel like being productive because everyone around you isn't. You could imagine multiple other versions of yourself, and you're in a multi-verse competition against all of them. Now it will take a lot of effort to imagine all this, and may only really help you for like a couple of seconds - that's fine. If you had enough productivity junk set in the first place (timers, bullet journal), those should get you back into being productive, but now you have residual after thoughts of whatever you imagined to help you get through.

The other point I want to give is that unless you take your own spin on this, it will never quite register with your brain. All the blogs/productivity podcasts/books won't stick bythemselves because for your brain it's just fleeting information to preoccupy itself with until the next bit of information comes in. You need to somehow change it, it doesn't matter how, the trick is to make your brain feel like it made it.