You probably aren't doing enough to mitigate bad luck. Start applying proper climbing technique: op.gg your teammates every match and avoid obvious trolls, premades with low win rates, intentional feeders, tilted players, players first timing champs in ranked, and poor team comps (particularly this last as an adc main), by dodging. Lp doesn't matter, mmr is everything. Play during prime time ranking hours. Not right after school lets out. Not after midnight but before 6 am. Stick to your main role and champ, one tricking is still the most effective method of climbing. Just try to eliminate bad luck from effecting you as much as you can. Oh, and find a good jungler for a duo of all else fails.