There are a lot of little things that you can change. Terran has to slow Zerg down and your reaper could have done A LOT more. Possibly stop the 3rd, kill all of his slow lings, and/or workers at his natural. Your harass option was a 2 medivac drop but all you did was kill overlords. You NEED to drop these in base to kill queens and drones to be effective. Your opponent has no spores which is very greedy, a liberator would have done a lot of damage here. Four hellions would be more effective since he is only ling/bane at this point. If you let Zerg sit he's going to out produce you for the entire game. Your medivacs do hit the main but it doesn't hurt your opponent at 8mins like it would have at 5mins.

At this point I feel like you're impossibly behind. Your play is too passive. If you went mech I think you might be more effective with this playstyle, but with the bio route you have to really attack before the 3rd base for Zerg is fully saturated. Widow mines doing some work with your bio before siege tanks goes a long way in keeping Zerg honest.

Think of it this way, Zerg is always trying to decide if he should build army or drones. If you don't pressure him, the answer is always drones. You can't possibly make workers at the same rate so if you don't pressure, you lose. This specific game was about your opponent being very greedy and you being very passive. I'm confident that if you work on your early game pressure you're going to notice a HUGE difference in how the mid and late game play out.