The brain needs time to learn after practice ends. Forcing too much practice stops the neurons from settling down and fatigues muscles. Take breaks.
New challenges help you imagine yourself better and reach higher levels. They give motivation and healthy rivalry.
Sometimes when you are stuck, you don’t need more practice. You need breaks and let the brain continue doing its automatic learning processes via sleep and rest. When you are stuck, move on to a different lick or exercise.
Music is contextual. So study your scales and exercises in a way you make music using them, not just learn and memorize shapes. Play scales to chord patterns and drums.
All scales, chords, styles, support each other. Specialize when you can do a little bit of many things. Not 1 thing perfectly. It's music. it's variety.
Improvisation is using all your knowledge in music in the moment to make music. It's a skill, so practice spontaneous changes to planned music. Improvisation births creativity.
When you focus your eyes and ears too much on your hand movements and sound, you are preventing yourself from trusting muscle memory. You need muscle memory for your playing to be automatic. Look away and wander while your hands move.