My technique boils down to whether I'm unmotivated or tired. It can be applied to anything basically. So when I'm unmotivated I just force myself to get started, by doing things I'll gain motivation. When I'm tired I do something less "demanding" that I consider productive still.
Notion - for documentation everything
Figma - for Mockup, wireframes
my Maily Wizard - for communicating via email
Slack - for communicating in workspace
I follow what Sam Altman once said regarding this very same question: startup life always tough or (aka suck), especially for founders. so when facing burnouts, the key is just keep pushing forward your product and keep working hard and dont letting yourself too comfortable or too chill, so whenever my motivation or productivity suffering, rewatching his talk about this gets me back on track everytime. that's just a little of my technique.
HyperSwitch
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darklens
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Maily Wizard AI
SayData
Pythia World