Earlier quoted context omitted.
What is your alternative to the Citizens United ruling?
The exact opposite of it: money isn't speech, so restrictions on campaign financing aren't infringements on your free speech rights. Not letting you spend millions on campaign ads is not an equivalent of silencing your political opinion - you can still speak, write etc as a private individual, same as any other citizen.
Can I spend $10 million creating the youtube video, if I have that much money as a private individual?
Can I organize a group of 10 friends to each spend $1 million on the youtube video?
Can I organize 1 million people to spend $10 each on said video?
Note that under McCain-Feingold (which is the law that was at issue in Citizens United) the answer to the second question is "yes", as far as I can tell: the law instituted restrictions on corporations and unions, not on rich individuals.
Whether the answer is "yes" for the second and third question would have depended on whether youtube counts as "broadcast, cable, or satellite communication" as well as whether a gofundme campaign should fund under the law, and so forth. So it's really not that hard to come up with loopholes around this stuff, if you want to allow spontaneous grassroots production of political youtube videos.
(Also, one person's "political ad" is another person's "documentary", often enough; this goes in both directions.)