i think what makes rakan so hard as a champion is that his earlygame stages is too delayed. his knockup takes, with dash and animation together, 1,5 seconds to cast. that is way too long, and only slowed champions or champs that stand still for any reason whatsoever or champions you can literally hop onto so they are in the very center of the hitbox can be knocked up, anyone else can simply walk away, and as if that does not serve enough, he does not have the efficient Tools to carry anyone pre-6, his cc powerspike depends too hard on his lvl6, and as if THAT is not bad enough too, he literally Needs to bump into his teammates to proc his healing, the trigger range when it charges are way too small, sometimes you stand legit next to the adc and the heal still doesn't proc because you are JUST A LITTLE too far away.
my best guess is don't buff his scalings or numbers, buff his ranges and animations. make the healing proc range and activation range bigger for, idk, 50 Units (half an meele AA) bigger and make the jump animation for his knock up faster so that ppl don't permanently dodge it even when slowed just by sidestepping early enough.
what rakan's Problem is is that he can be countered too hard, his dashes are ALL canceable through hard cc, you can peel him to deny his adc any healings and shields and if you zone him he will Need to dive too deep to use his R and end up dead before his team can even follow, rakan as of right now is really and i mean REALLY only a show and really only gets useful when massively ahead as a support or if he, as the support, can get his team to peel him so he peels them (which not only shouldnt happen but also shouldnt make sense to begin with)