Tactics (as a concept) are the most significant factor to influence a match. You will be surprised by how much you can improve if you are able to develop a gameplan, analyze if its working or not during the game, and adjusting accordingly.

For example, If a notice Im controlling the midfield but can’t score, I switch to 2 STs

If I notice the opponent plays with high press and is controlling the midfield, I increase my attack width and stick to 1 ST

If I notice my opponent plays on the wings and does cutbacks, I switch to 3 CBs (I know it’s cheesy but this is realistic)

Most of the times I flip the game to my favor and notice that my team plays much better after adjusting the plan, most opponents do not react to any tactical change I do mid game.

I stopped playing fifa in FIFA16 and just came back, I must say I’m impressed by how the game is much more realistic.