You must define a strategy, a game plan for your own style of play. It is impossible to set an ideal game strategy. Each player plays the tournament in a completely different way and too many situations happen when you're at the table. You need to improve your gaming experience, when you see a lot of hands and a lot of different situations at the table, you start to understand how to act. Free tournaments with a very small starting pot and re-entries are absolutely wrong tournaments for a beginner.. + I don't recommend playing knockout tournaments...
There are several basic and initial recommendations for playing poker. I advise you to build on them and continue to plan on your own, through mistakes and learning the game from the example of other players. After that, you will be able to build the necessary line for yourself and have a plan of action at the table.