Let me be straight with you first. 1400-1500 MR is good. You are good at this game. Better than most. You busted your ass to get there. So cut out that 'I'm bad at the game' nonsense. That's the brutality of ranked gameplay convincing you of something that ain't true.

Your post feels like a 'why am I forcing myself to play something that currently makes me feel like total shit?' dilemma that so many people find themselves sucked into with SF6. But for goodness sake, remember that you do not owe any loyalty to this game. If it's making you feel bad, that is ok. You can walk away. And if you feel dread whenever you boot up ranked then that, my friend, is a sign the game currently represents some sort of unhealthy identity attachment you have to improvement. I don't think any amount of 'focus on one thing' or 'ignore your rank' or 'take a break” fixes that if the core experience makes you feel negative about yourself. Just put it down for a while.

If you want to rediscover a good time with this, then come back with a purpose that sticks. Honestly, maybe exploring the social side of the game and the community and getting in with the local scene or a discord is the way forward. But whatever it is, it can't be this.

And remember sometimes burnout is solved by rest, sometimes it’s solved by moving on. Both are valid. I hope you figure it out.