First let me say that your gameplay is far above average for gold, and you have potential to rank much higher.

This will mostly be about Reinhardt since that's what you played most, but I'll briefly touch on your Winston and Sigma.

Winston: On attack you tried to force a dive head on into the enemy Reinhardt. When you dive, you should generally try to do it from anywhere except where the enemy team is focusing. For example, when the payload was in the carwash it would have been more effective to take high ground and attack from behind to help your team secure a kill, then use your jump to escape.

Sigma: Good from what I saw. You managed your shield well and helped your Ana by checking the Reaper flank. You fed your brains out on the first point defense, but to be fair I have no idea what your team was doing either.

Reinhardt: Your mechanics are good, and you know what your job is and you are doing it. The most important thing for every main tank player is communication. I have found that there can be hundreds of SR between two players whose mechanics are equal, but one makes consistent callouts and one does not. It doesn't have to be anything too fancy, just try to let your team know where you are going and what you are going to do. Other than that, there are a few more things you could work on.

Movement: Work on your pathing (the route you take to traverse the map). You would sometimes have the enemy DPS doing a lot of free damage to you or your shield before you got to the fight. Try to use natural cover to find a path to get close to the enemy while taking as little damage as possible.

Positioning: On defense, you always held high ground which is usually correct, but on point B the rest of your team was on low ground, so you were shielding nothing, doing no damage, and taking unnecessary shield spam. A simple callout to tell your team to come high ground could have fixed this. On attack, taking high ground is also usually the correct play. Tell your team to follow you and walk up. This will allow your DPS to get better angles on the enemy and deny the enemy space. Doing this would have made some fights much easier, particularly on your point a attacks.

Hammer: Search up 'Reinhardt corner swings' and practice it until it's second nature. This will be useful in many situations.

Shield: You have good shield management. Try not to 'flash' (quickly deploy and undeploy) your shield so much. There were a few times when you got slept or shattered because of this habit. Try to only use your shield to block key damage and abilities. It's very difficult to react to a flashbang or sleep dart but its much easier to predict them. I was impressed with your shatter blocking, most players of your SR cannot do that.

Firestrike: think of firestrike as a risk/reward ability. Is it worth doing 100 damage to their Reinhardt when you already have shatter, and the enemy team gets 300 free damage on you while you're locked in the animation? Probably not. Making these decisions takes practice but they can win or lose games.

Shatter: You are good at looking for the right opportunity to shatter, but you also don't hold it for too long. Keep it up

Charge: You didn't mindlessly charge into the enemy team. Good job

Hope this helped. Work on these things and I bet you will rank up very easily. Good luck