league and the elo system help pls...

hello, ive been playing league for about 2 1/2 years now. when i first started playing ranked in season 5 (not counting the few games i did i s4) i won i think 3-7 im my promos and got b4. i was really hyped to get this rank. after playing a few more games though, i found myself at b5 with no lp.

after in b5, i waited till the next season for my promos. i wanted to get to s5. going 5-5 i got placed in b5. saying to my self i can get out, im trying my best. but ffs b5 is a shithole and i cant get out. im not looking for comments like "u deserve to be there" or "dont blame ur team mates" every single game i try to carry but they are way to heavy. i never get a negative kda unless i dc. for example i go 7/0 and bot feeds so hard they are up to inhib at 15 min. mf is so fed she 2 shots me. i srsly dont understand this bullshit anymore. go onto my profile and check out my profile. all i want is some tips which can help me improve my teams gameplay. ill gracefully accept all my faults and strive to change. please i need to get out. critisize me as much as u want. thanks. ( im typing on my phone please excuse the mistakes)

EDIT: i was on 91lp but i got carried down so hard