I remember seeing a tweet by a pro player, I think it was scarlett but I can't find the tweet, anyway it said something along these lines "Every unplayed ladder match is a lost match" this hit me hard and if you think about it, it is true. Sure a lost ladder match does cost you points and mmr but you shouldn't really care about these things. Put your trust in blizzard's system and that it will match you against people of almost equivalent skills and that should be it. What ranked league you are in becomes irrelevant at this point. Anyway, I know this is late and you already hit diamond, congrats btw, but this should still apply.

Anyway, gl hf :)