Watch the C7 Blues Quick IV online guitar lesson by Rob Garland from Melodic Soloing: Blues Chord Tones
For the C7 blues, how did I connect the 3rd's & b7th's? I'm seeing a combination of the chord voicings and arpeggios. Play through the arpeggios and look at how my licks use the chord tones with bends and additional tones to spell out the harmony of the chords.
Once again, I'm repeating the main theme and leaving space. Even if you just focus on one chord tone on each chord that's only 3 notes! Or take the 3rd and b7th.
Also be aware of the major and minor pentatonic in this key, C, and work chord tones into your more familiar blues licks.