Most of it involves giving the general non-corporates creators ANY incentive to make content that is actually worth watching.
The status quo is mostly fine for the content that I watch. I don't see why half of your ideas are needed. I also don't see why Youtube would be incentivized to make them work. For Youtube they want to maximize viewing time, not maximize viewers for any particular channel's content. Some series get cancelled in regular television. Some channels get "cancelled" by the algorithm on Youtube.
On 2, I don't use the rest of the Google ecosystem except at work. Youtube, by itself, does absolutely nothing to "lock customers into the Google ecosystem".
On 3, the algorithm isn't great but it isn't worthless.
On 4, I do get a lot of top recommendations, but also get more than a few recommendations of channels with <1000 subs. I don't know what your watching history prioritizes. For the creators, some sales effort may be needed in commenting on and referencing other channels, or just posting your creations on other social media when it is relevant (and not pure spam).
On 6, I would like shorts to more directly link to longer videos, and would also like it easier to maximize the shorts on desktop, but otherwise I think shorts are okay (I tend to not scroll the feed, though).
On 7, I don't understand how Youtube Premium would assist with the creation process as opposed to just being free viewing content for creators? I also think this would incentivize a lot of crap content (life hack! Upload junk content of your potted plant growing once a week for free Youtube Premium!).
On 8 through 16, these either seem like good or great ideas to me, or I don't know enough to say anything.
On 17, many of the channels I actively watch are relatively small. If Youtube disappeared they'd likely never be hosted, or would be hosted in such a distributed manner that I'd never find them again.