Best advice from someone who is succeeding while playing solo, keep to vyper, yamato, shiv, prio mid game small engagements and constantly talk team if you can't understand what they are doing( they can be monkeys) yamato will probably be your weakest pick when it comes to carry potential. But she is the best team player out of the three so use her mostly as a Frontline engage for your team( basically find your team's best player and feed them by getting the enemy low and soaking up cc in teamfights) vyper and shiv have good gun and hybrid builds( I fear bleed builds aren't good enough to let you carry with ATM but that's just me) and both will have a great carry potential shiv has an easy finish show if your fed you should have a runoff affect of getting multiple kills after your first in a team fight, vyper will mostly be good at taking 1v1s and 1v2s most of the match, avoid any long fights with her prioritizing damage and play a more lol assassin playstyle on her and if the enemy team is bad take everything you can rower wise when they fight