Champion suggestions

Hey guys,

Ive been playing league on and off since season 2 and tbh havnt really expanded my champ pool much in all this time. Champ pool (ones that Im confortable playing and the roles ill take them in if i need to)

TOP GP, Singed, Panth

MID Morg, Annie, Panth

ADC Ashe, Siv, MF, Tris, Cait

SUPP Leo, Annie, Morg, Janna, Braum, Sona

JNG whats that?

As you can see I mostly play bot lane and after some reflection on the last several games ive played im coming to realize that i really need to expand this to include some champions that can engage/initiate team fights. Am i wrong in this thinking? Im comfortable with leos and annies hard engages the issue im running into right now is that even though i engage the team and create an opening no one really capitalizes on this (Brone 4) perhaps they just dont see the oppurtunity?

Any suggestions on this would help a lot. currently saving up to buy Liss as I really like her play style. Would like to look into getting more mid and top champs that can engage and not necessarily have to wait for someone else to start the fight.