Modes and Scales lesson 8

Modes And Scales lesson 7

Application of Modes and Scales can't be talked without understanding the concept of Chord Substitution.

For your C#maj 7 chords, you have lots of Scales and Modes to improvise with.
This will make improvisation not boring and you feel like not ending the music.

When improvising on your C#maj 7 chords, your fourth should not be emphasised

You at the option of improvising with your Ab major scale which is equivalent to your C# lydian mode

Also, F minor scale could also be used (F Aeolian/ F Dorian)

You could also try C minor scale (C Dorian/ C Aeolian)