Im Plat 5...

im "just" gold but annie and veigar arent picks which fit into the meta. Try playing some meta champs. i can imagine that on plat people just keep playing things like seju ryze azir and other meta champs. I recommend you to take a look at champ winrates. If u want a new lane it depends on if u got a duo m8. Premade bots are pretty good and i personally carried my team with my pre support every game on the way to gold. got a 78% winrate with him. DuoQ is better in general.