Each season the game has code changes that affect other aspects of the game. Each season there are new more skilled plyers you are playing against. Each season your team gets a year older and their abilities degrade. I am sorry you are unable to adjust to the game getting harder.
The way to improve playing the game is to not buy tokens and try different tactics and note what works and what doesnt work. THEN buy your tokens to improve your play by being able to buy bigger weapons... I mean players.