40 ton hydraulic jacks inside the block-wall on 4 corners. Use 6x6 attached to walls and ceiling to jack up on, work it even (1/2” at a time) till you get the extra height then block it and install a new plate. Those walls are strong enough to support themselves and roof, if you feel you need one more post in the middle of the 38’ do it. Jack a little at a time, I’d do two more 8” block to get over 10” clear. We did my sisters house this way. Drill holes in slab to find hollow spots (usually just tapping on floor will tell you that and rolling a floor jack across floor you can hear the difference) fill the voids then pour the 6” slab (reinforced concrete) on top of old floor.
Forgot, use 2x4s at 45 degree angle to support wall (on each corner) on the outside like when doing a new wall, move ground tie in as it goes up.