How to change switched outlets to half switched and half always hot
You should not have broken off the tabs on the hot sides of the receptacles unless you had an always hot in the receptacle boxes.

If you want to restore the existing function without buying new receptacles, you can

(1) make a pair of pigtails with black or red insulated wire and connect to the two hot screws and connect the switched hot to that with a wire nut or

(2) make a loop with the one switched hot wire over to the other screw and strip off a little of the insulation, or

(3) if the receptacle has back wiring secured by a screw (not just push in) you can connect a jumper (insulated black or red) in the back holes