I need to practice :
Arpeggios starting from the 3rd 5th and 7th:
I noticed a big difference in my soloing as soon as I could properly arpeggiate through changes.
The important thing though IMO is to connect them smoothly, because in the beginning I always seemed to be starting from the the root on each new arpeggio/chord, which just sounds like an exercise.
Practicing arpeggios starting from the other chord tones seems like the way to nail this.
Also like Emily Remler and Pat Metheny point out, a good way get a good flow going and be able to cut in and out at any point is to practice playing every 8th note in the song, no breaks or pauses, so this would be good to combine.
I also need to internalise/focus more on descending arpeggios shapes + in general look more at melodic/harmonic arpeggios
All blues soloing and comping:
The Allblues soloing book has hundreds of ideas for soloing over the blues (and changes in general) in the style of many great players like Joe Pass Herb Ellis Kenny Burrell etc.
It covers a lot of different applications including Major, Major Pentatonic, Dorian, Mixolydian, Chromatic, Blue Scale and much much more
It really seems to cover all the essentials of soloing in the jazz idiom.
The art of Travis Picking/solo fingerpicking:
I always enjoy playing and learning finger style pieces since I really neglected this important part of playing the guitar for way too long. I need to focus on changing chords smoothly as well as getting a good groove going. I have a fairly good grasp of the first 3 patterns (O-I, O-I and pinch) but I need to work on the last one, alternating between the patterns and then start adding slurs.