25.60Blues phrase structure over 12 bars

Try:

Bars 1–2

statement

Bars 3–4

repeat/variation

Bars 5–6

new response over IV

Bars 7–8

space or return

Bars 9–10

climax over V-IV

Bars 11–12

answer/turnaround

Now you're improvising across the form, not merely surviving the chord changes.