The 4-3-3 stopped after the S'ton (A) game when James played crocked, Richarlison was suspended and as far as I can recall hasn't been used since, with injuries to different players at different times not helping that.
We've actually only played 4-2-3-1 about 2-3 times in that December run and Richarlison played okay, just without the goals to back it up.
Yeah, the 5-3-2 hasn't worked for the strikers because it just leaves the front two isolated as our midfielders don't get up in support or, if they have tried to, Carlo hasn't played a sitter so there's been huge gaps that teams have exploited.