From 17 Games Undefeated to 4 Straight Losses, what am I doing wrong???

This is my first time actually trying to somewhat successfully build a squad and dominate my league. Everything started out great, we went on a 'legendary' 17 game undefeated streak(in the league) of 12 wins and 5 draws but then we've suddenly forgotten how to finish our chances, losing games to relegation threatened sides, I was losing 4-0 in 30 minutes Bristol Rovers but my mental was cooked at that point and I woulda punched up my laptop if I kept on going so I closed the game. Anybody got any tips/reasons on why we've suddenly forgotten how to find the back of the net? Anything helps thanks

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