Depends on whether you belong in your elo or not. I was low silver. I didnt believe I belong in low silver. After hundreds of games I gave up and did placement on my alt. Got gold. 63 games later and I'm still gold, not silver, not bronze but gold. Can't wait until I'm able to unlock my main once I farm enough BE, I should be able to hit upper middle gold by then.
If you think you don't belong in your elo, then roll a new account and start fresh. You can't carry games even if you're 1 tier above where you belong. You need to be at least 2 tiers above before you can consistently carry.