Still?? How much longer? I can't even use Piranha Plant (who plays too demandingly to me) after losing so much.
A few things on this regard. Firstly the first really big tournament hosting Ultimate will be happening in a week or so, and the game itself is about a month and a half in its life, so it is still pretty young.
Second, try not to be so frustrated with playing the Plant-they are a new character so getting through groove of the playstyle is rarely an overnight thing and may take a bit. That's not even factoring how I'm getting vibes they might be one of the tougher characters to play in the game.
Lastly, the issue I'm seeing here is your requests for a severe Nerf, and that is the type that needs to be generally avoided. Every game will always have a #1, but the trick is keeping them in check so that counterplay is more versatile against them and others can compete. This last patch did that by removing some of the cheesier win options like Chrom's meteor or toning back some of the oppressive tools like Inkling's Roller or K.Rool's windbox.
It's like the last FighterZ patch that stated what characters would not be tweaked because they feel they are at the power point they feel is appropriate, and 2 of those characters were Ultimate Gohan and Vegeta, the former being top 3 at the time and the latter tied for best assist alongside Yamcha. I'm getting similar balance philosophy here, since some characters that were considering among the best by some in early times (Young Link) were kept the same too. Last thing we need are characters getting nerfed to Melee Kirby levels after all.