I play tank in Ranked games, mainly tigreal. The problem in lower level ranks, even you follow accurately all of the suggestions is that the players are mostly noob. Most players in lower ranks want to play the killer role, but due to inexperience, even if I catch like 4 players in a clash, these noobs don't know the timing when to support me and I end up simply dying and them not killing the enemy killers, so we'll all die.
You're lucky to have just 4, I seriously actually had an 11 game losing streak because of uncooperative noobs and AFK trolls. Went down from GM V to Master II. Switched to Classic, lost once, I got really frustrated I didn't play for almost a week. Imagine having to carry as a support, even if you rack all the kills you will still be defeated because you lose in terms of pushing turrets. I was Nana with 14-1-15. It really sucks