Heavy on the quotes, bc for me it's not the typical sitting-down-and-closing-your-eyes meditating, more of thinking about something that would/used to relax me or make me happy. Something like just laying down and listening to a podcast, or actually getting up and playing a video game. Building some kind of routine around that also gives you something solid to feel less bored.
I for example started to be more mindful about what i see online. Cleaning negative stuff out of my feeds, blocking people that irritate me instead of reacting to them, hitting that not interested button more often...
It also helped me, to acknowledge how bad i was feeling and making that decision to want to change, to want to feel better.
Yes, it's hard motivating yourself, getting out of that slump, and it's hard to make the first step. All you got to do is just do it. Really, just take the first step.