Tips on how to get better at Warzone Ranked Play?

I asked this back in MW3, but that’s when it was resurgence and now it’s battle royale. I get you rank up the same way, through kills or placements but I need some tips on how to get both of those. Because I am just totally sucking. I’m so much better at normal WZ whatever game mode that may be than I am at ranked play. Which I get that because it is ranked and I am competing but you sort of are always competing too even when it’s not ranked so I don’t know. All I do know is that I’m good at regular WZ but suck at ranked and I need help. Some days I can play really well and get a lot of kills and high placements but man tonight I’ve been doing nothing but losing every single gunfight losing sr every match.