Any recommendations for fun to play and slightly mechanical champions in high elo?

Now right when you look at this post you may be wondering: "Why the fuck is there a level 13 kiddo talking about "high elo" sht." Well, apparently riot never syncs your boards profiles with your in game account until you ask them too. (Jesus Christ I have so many accounts that are displayed as "level 1" in my boards profile) I am currently plat II on my main account and have been climbing through platinum at a steady rate. (10-15 games for each tier, 30 for some reason for plat V cause I lost promos 4 times) I play Annie and Fiddlesticks mid. Annie having a 70% wr in 55 games and fiddle with a 75% wr in 30 games. The problem is that I don't know whether or not I can continue playing these champs due to nerfs that might happen to Fiddlesticks to make him not viable for mid anymore; and Annie just seeming incredibly boring and extremely repetitive. I am hoping to pick up Xerath or maybe Orianna (Once I get 4800 ip) and start maining them instead, would that be some decent picks?

Tbh I have probably gold-plat mechanical skill/micro skill, but my macro is around diamond I ish level. (Input made by a coach that I paid to spectate a few of my games and then etc. etc.)