I can advise you not to think about the size of the tournament when you start playing. You must have a strategy that you will build correctly and follow it, gradually in the tournament. Not right when you start looking for a lot of different opportunities, if the tournaments are big or small..
You will make a lot of mistakes, you will look at the game of your opponents and forget about yourself. You must build a system that is convenient for you. The game plan for each stage of the tournament, (Start, middle, final stage and final table), to know exactly how to play, in different situations at the table. Opponents are important, but it is more important when you lead the game and show initiative.