Honestly, if you're deep in Bronze 5(I didn't look at your profile to check), it can be kind of difficult to make it to B4 and above, simply due to having such a ridiculously low MMR that the only people it matches you with are the 8 year olds that don't understand the game, and legit trolls(From what I've been told and observed. I guess I really don't have the personal experience to back it up). Most often this is caused by joining ranked right away at 30 before you have a good understanding of the game, and just bombing the first ~100ish games with a 30% winrate.
No idea if that's what happened to you, but my recommendation is to wait until the season resets and try again as bad as it sounds. At the start of the new season there's a "MMR reset". They're breaking ranked into two Queues next year, Solo/Duo.. And Dynamic(Similar to this year) from what I gather. I'm told that Dynamic uses this year's rank and gives a "Soft Reset" to your MMR(Same as usual in a new season) which loosely equalizes your MMR towards the average from what I understand. Basically, you'll end up placed back in Bronze most likely after your placements, but for your first 20ish games your LP gains/losses should be much higher than usual, to get you stabilized into the rank you should be at. If you should be higher, this is when you prove it. I like to play these games late at night(NA times) because I tend to find friendlier/less tilted players personally, but you do stand risk of that tired guy or whatever.
The new Solo/Duo queue is rumoured to have a Hard MMR reset, meaning EVERYONE is reset back to the same default MMR(Silver 4 I think?) and their provisionals decide from there. Same as the other, your first several games will have bigger gains and losses.
