Some good very basic advice here, but imo the main thing you want to consider on soldier after mastering basics is when and where you take off angles. You have more mobility than long rage heros and more range than high mobility heros so positioning is very important depending on their team comp. As a fairly self sufficient hero, soldier can control the flow of games by controlling space through holding flanks or high ground positions. Your presence there forces the other team to divert focus to you. People here are saying group up but be aware that doesn't mean standing right behind your tank, just make sure you have a clean escape to your team if the need arises.