Calm down. First.
I will help you now.
The most important thing to take away from the following information I give you is that LP is not important in any way, shape, or form below diamond level play. At all. MMR is important. Dodges only cost you LP, not MMR and this has been true since the introduction of the League system in season 3. Thus, dodging, in essence costs you nothing but wait time. You can use this to your advantage. This is the most important thing to take away from what I tell you.
Now, here is the thing about ranked and the ranked system. The system is atrociously flawed at lower levels of play and does not (unlike many might lead you to believe) rank players according to the level of skill. This is because the system does not use any individual skill datapoints when making its determinations. This is important to know because it means that for all levels of play below diamond the system is ineffective at performing its sole function. This is NOT an excuse for the inability to climb! The system is broken and thus, it can be abused. There are several ways to do so. The sad fact of the matter is that since the ELO system was imported from chess (that's right chess, and individual on individual competition, not a team game) the system is more prone to ranking players according to the "luck" or "chance" factor of who you happened to get paired with. Since matchmaking takes into account no skill reference points, matchmaking will often pair players poorly since the level of variance for two players with identical MMR in low elo can be as wide as the difference between a silver and a diamond. Part of climbing is understanding the system and how to combat the luck factor in addition to your skill as a player, a team organizer, and a diplomat. All of these skills will be required to reach an accurate ranking.
Lets discuss some ways to avoid the luck factor. The first thing you should do in every champion select lobby is op.gg your teammates. Find out what they are good at. What they are bad at. If a player is playing a champ for the first time ever in ranked, that's a red flag. Its unlikely to go well. If you see a pair of players who always duo and have a less than 60% win rate, this is a red flag. Its unlikely to go well. If you see a player on a crazy loss streak that player is likely tilted. Its unlikely to go well. You getting the picture? We have a tool in place in addition to using this op.gg information that can help you combat the luck factor of being paired badly in these scenarios. It is called the dodge option. Use it. But you are in promos? Doesn't matter, use it. Lp, as stated before means absolutely nothing in low level play. Only MMR. MMR is determined primarily by win rate, MMR determines LP gains and losses. Thus, a higher MMR will give you increased LP gains. It is best to focus exclusively on win rate in low level play and work on improving it to increase MMR and thus gain more LP per win. More LP per win means faster climbing. In some situations, if your MMR is MUCH higher than the average of the division you are playing in, AND you are on a win streak it is even possible to SKIP past promos entirely. Meaning the system will promote you without you having to even play in promo matches.
Additionally, when you reach promotional matches the system applies a handicap to your team for the match and you will be matched with "more skilled" opponents with higher MMR and with "less skilled" teammates of dramatically lower MMR. The system does this as an attempt to make you "earn" the promotion. There is another scenario where this also happens. When you duo. Your team will also be handicapped. Now, when in promos it is advisable to ALWAYS duo with a partner since you are already handicapped. This decreases the likelihood of you getting a troll on your team, gives you a player you are already coordinated with and have chemistry with, which is an advantage if the match is played. Also, if your duo is not in promotions themselves then guess what you can do? You can have them dodge for you and you get to STAY in promos! This also helps to combat the luck factor. If you get trolled as a singleton in promos its advisable to still dodge rather than play, its not worth it to lose MMR in an auto loss situation, and one win will get you right back into promos. Even if you dodge twice in a row most likely. However, it is still best to use a duo in promo series, since you can use their dodge as a free "get out of jail" card.
All the best of luck on the fields of justice summoner!