Not meditation in the "focus on one thing to the exclusion of all else" sense, but mindfulness based on the practice of Vipassana, which roughly translates to "see things as they really are" and stems from Buddhism.
As part of this practice, one is taught that emotions are just appearances in consciousness like all other appearances in consciousness (sights, sounds, smells, feelings, physical sensations, etc), and by becoming aware of/observing emotions/thoughts instead of just feeling them and identifying with them, the power they hold fades quickly.
It's hard to describe the anti-suffering impact this seems to have in words, but for me, the difference has been remarkable. Emotions are still just as critical as ever to live a fulfilling life, but how you relate with those emotions can change with practice and re-framing.
I started this exploration as the ultimate skeptic, but have found it to be far more practically helpful than I expected. Having a good teacher seems to be important, as they will continue to help you navigate the earlier stages of figuring out what you're supposed to actually do (turns out it's more about what you're not doing).
I've personally been using Sam Harris' "Waking Up" app, and find that quite useful, but there are many more resources available.
The suffering stems from the reward being external. If the reward is in the self or from the action itself, then there is less suffering. Self fulfillment.
Less suffering only, to take into account an inability to act.
This has been argued to be one of the defining characteristics of games.
Summarized into a saying: Treat every task as an end in itself, and you will experience more enjoyment. That’s a value in its own right. So do it, just for the sake of it.
I think this is more important in craftsmanship than we’d like to admit: striving for perfection for the sake of perfection.
It has also been argued that beauty in itself is a strong motivating force and the best heuristic to aim for in mathematics/physics.
Shopping Cart Theory:
This idea is taught in The 7HoHEP by Stephen Covey.
I prefer the Japanese concept that, and I'm paraphrasing here, "every action has a purpose." Putting value on the actions themselves adds an appreciation for the moment you are in, and the process you are doing. It then becomes a sign of respect for you to do everything in your life to the best of your ability. There's a whole philosophy about this, but the name of it escapes me.
A few things I've found that are related: "The was of the peaceful warrior" - Book
This is water - https://www.youtube.com/watch?v=eC7xzavzEKY
Sorry if this is a little rambly, I have ADHD and my adderoll is doing its thing.
Any deed done with reward in mind creates an expectation which, if not met, causes suffering. Similarly, you will end up focusing more on the reward than the task itself and will unable to be loyal to the task. The only reason you must do a task is because you must do the task i.e. it's your duty to do so (either self-imposed or originating from a construct you follow).
This is such a conflicting piece of advice that goes against the fundamental reward-driven human biochemistry. But I've found that in following it, you really begin to tune out suffering and start to discover something that's a bit above being human.