It is still possible join "solo queues" with a partner and this can increase a bit your chance to win.
Try then to find a good friend to play with and try to find heroes combinations that work well together (synergies). Optionally use TeamSpeak on any other voice program to communicate in-game.
Usually in low ELO games lot of people do not understand how important is having a balanced team. Having no stun/crowd control or not enough tough guys (tanks/offtanks), no jungler, could probably lead to a bad loss.
Try to "fill" the holes in your team by selecting an appropriate champion (jungler, tank, offtank, support, ap/ad carry, etc.). From my experience what usually misses more in low ELO are tank/offtanks and solid junglers. Of course, before being able to apply this effectively you need to buy and learn to play decently different typology of champions.
Regarding the other three members (four if you play alone) you will have in your team the only thing I can say is to try having e a positive attitude towards them (do not start calling them "noob" at first dead). Communicate in game when needed and try to propose tactics.
Applying all these suggestions could help a bit, but for sure is not easy to climb the ladder and exit from ELO hell. I went down under 1000 in ELO and now I am finally reaching again 1300, after months of attempts.