The same happened to me (Lvl 10) at Day 14 of this season: I was 1st and I lost 0-2 vs the last and after that a streak of 4L+2D.
I tried to move to 442 and basic tactics but I was keeping on losing even if statistics were almost always in my favour.
I rememeber one match in which I did 13 shots on goal vs 2 and I lost 0-2 LOL.
My 2 ST both scouts with 7.7 avg vote started to have scores like 5-4-5-6-5.
I was desperate!

It ended up when I bought a new MR-AMR scout (with free tokens) and a new 5* MC, I sent 2 scouts to the bench and I lined up 2 ST's 4* bought last season.
Now I'm in a 5W streak and I was able to climb until 2nd place.
Konè which is by far my worst ST is always MoM and new players are scoring at every game.