Caro Kann failure
It's not the opening.
I'd stop with the Bullet time control... and play longer time controls
One of my favorite GM's was George Koltanowski (famous US Chess columnist from about 1950-1980... ranked at one time top 20 in the world (mid 1930s) stated many times "If you want to improve your chess DO NOT PLAY SKITTLES!"
I'm going through the same thing you are at a little higher rating i.e 1400s last year or so I have been playing nothing but blitz... It retards my tactical skills... all I end up doing is banging out moves, with no critical thinking ..
For me... It's back to tactical problems and longer time controls