meh.... that's a dumb way to look at it and you will never rank up being afraid to rank up. Only time you should be "afraid" is if you feel like you not in the best mind set to play ranked. A better way to view ranking up is this.
Are you rested, hydrated, and feel like playing ranked and going to try hard? If yes play ranked game. If not, don't.
Have you just lost 2-3 ranked games in a row? Time to take a long break. People go on insane losing streaks to tilt, but if they just stopped playing for the day or swtiched to norms and then some other shit for awhile before going back to ranked they would significantly reduce their losing streaks. Even if you don't feel tilted, generally sometimes you are. Sometimes it just a case of bad luck but either way some days just not your day.
Its hard to describe but I have totally noticed this shit when I played ranked. I used to spam like 7-8 ranked games a day and by the end I am always brain dead and mostly relying on my teammates instead of myself. If I am on a win streak though I keep playing if I feel like it because you want to get those wins when you can. But when I hit 2-3 losses in a row a take a long break. Sometimes I just quit for the day. It's weird some days you can play super well but just always get shit teams so its time to just kiss ranked goodbye that day and try again another day. Even even just give it a couple hours.
Honestly if you are trying to play your best every game ranked really should be kind of tiring. There is a lot to think about and do game to game, and when you jump into auto pilot mode you are not playing your best and reduce your chances of winning.