I need to diversify my champion pool
I play Morgana Emerald 2 almost as a one-trick, with occasional games as Sona, Nami, Thresh, but my results with them are meh, with disappointing win rates. I want to expand my champion pool whenever she is mediocre in draft, not only when she is banned. I am looking for a proactive support that deals damage. I know which champions kinda fit into these roles, but I have difficulty working them into my pool.
My strengths as Morgana : I am extremely active in dominating opponents and can play very aggressive, initiating risky dives that people don't take in my elo. I have multiple cheeses that work with high %, I am coordinated with my jungle. I can alternate between peel and engage. I am good at assessing lane state, freezes. I try to think about winconditions.
My weaknesses : I take too much farm. I sometimes win games by split pushing till nexus when toplaner doesn't do it. I know this is not a good thing. I throw out Qs like candy, knowing full well that it entails losing pressure. I die to get last auto attack on ward. I go on tilt sprees where I die on repeat. I am sometimes lost on itemization, building Ionian 9/10 or sorcerers or occasional merc / tabi.
Sona : I play around my danger zone and have difficulty putting in the discipline to never actively try to use Q on enemy champions. I meaninglessly waste power chords. I die too much and am slow on W damage debuff. I am lost with itemization. I have the occasional 1v9 carry when I am good on my movements.
Nami : I die a lot and fail to balance aggression with control. I throw good bubbles but often wasted. I don't understand how strong she is. I am lost on itemization.
Thresh : mediocre positioning as I'm often behind. I feel underwhelming even when landing hooks.