Bronze is a coin flip, but there is some science to it. I can see your huge loss streak you have going, and I've been there too. Once I went on a loss streak from Gold 5 to Silver 5 then back up to Gold after. So don't feel bad for losing a lot and do not get frustrated with yourself. The way I like to think about it, is that every forest needs to burn down before it comes back stronger.
If you are just looking to untilt yourself I highly recommend watching a replay of an LCS game. Cloud 9, Immortals and CLG are currently the best teams. You don't have to over-analyze it. If you have a certain pro player that you like, such as faker, you can watch replays of their solo-queue games. This always helps clear my mind and gets me actually excited to play, not just win.
An important aspect of the game is identifying win conditions. In Bronze no one really thinks about the best way to win. Usually they will just lane then group 5 mid and continue pushing until someone gets caught out or a team fight happens. It's important to understand your compositions and match ups. For example, If I am Lee Sin and they have a Jax jungle, I am not going to farm until late game. Because if I do that, Jax will have sated devourer and I will fall off hard and lose the game. Instead I will buy a Trackers Knife, plant some wards in his jungle and then continue to kill him early game while he is weak. Another example of win conditions is whether you have a split push comp or team fight comp. If you have a Fiora, for example, she is better just split pushing then TP'ing in if a big fight happens rather than just grouping with the team and getting poked down.
And as boring as it sounds, playing "OP" champions seems to work. When Kog'maw and Xin were really OP, I spammed them a bunch and won most of my games. Also, in game, people generally seek leadership. I know that in low elo a big mistake is overstaying, not taking an objective, or just being very wishy-washy. Do not be afraid to make calls and ping people back after taking an inhibitor, or ping baron or dragon. People will most of the time listen to your calls if they are not sure what to do next. League is kind of like a conversation that you need to keep going. Sometimes you need to bring up new topics to keep the conversation flowing or it will die out. Similar to how you have to make calls or else your team will not know what to do and will just "die out" essentially. Also, if you notice your team is falling behind don't be afraid to say "we can still win" or something along those lines. People need the encouragement.
Another important aspect is to establish dominance over your enemy, and have a mindset that you will win. I think this is why people go on win streaks, because they feel like they just can not lose after winning so much. SKT T1 went undefeated in worlds not just because they were the better team but because other teams feared them and that affected their play, similar to how in a losing streak you fear losing another game and it will negatively affect you. Instead of thinking about the enemy as an elephant that you must crush, think of them as an ant instead. If you go to arm wrestle someone and you are nervous, you will become shaky and weak and lose, even if you are usually stronger than them. League is no different.
EDIT: Spend all your future IP on Tier 3 runes. Here is a cheap set up:
- AD Marks, Armor Seals, MR Glyphs, AD Quints
- AD Marks, Armor Seals, Scaling AP Glyphs, Flat AP Quints.
