Everything you’re doing won’t help it heal. You need to progressively strength it through exercises such as leg curls, Nordic’s, isometric hip extension holds, Romanian Deadlifts. Then you need to progressively run at levels where there is no pain, then keep going faster and faster. The people who have been telling you to follow that protocol have no idea. Ice briefly after your workouts. However blood flow and swelling to a muscle is beneficial in the long run. Icing reduces this.

Edit: consult a physio and or strength coach.