You can't. Brazzers used to have something. It was called the PornPortal. You could enroll in Reality Kings, Digital Playground, Mofos, Reality Gang, Twistys, Babes, Eritos, Mile-High Media, Property Sex, Pornhub Premium, Playboy Plus and Wicked Pictures, etc. And as long as kept your Brazzers subscription in good standing, then you were able to access all the content you paid for through the PornPortal. However, since 2019, they've done away with it.
Now, you'd have to enroll in each studio's network or website. And each one is its own separate charge. And as each site can run approximately on average between $25 to $35 per month. With just ten websites, be willing to spend between $3,000.00 to $4,200.00 in a year. The $3,000 yearly subscription price would be ten sites at $25/mo. The $4,200.00 price tag would be ten sites at $35/mo.
Greg Lansky sometimes runs specials on the sites he runs: Vixen, Blacked, Tushy, Deeper, Blacked Raw, etc. Look over there. The one-time subscription price may still be available on the seven or eight websites. You'd have to check.
Puba and Adulttime may suit your interests.
Pornworld/Pornbox may also suit your interests. That place has all the Denys DeFrancesco DDF content as well as all of the LegalPorno content.
Lastly, Teamskeet does offer a Premium package. All sixty-two (62) sites. Kind of expensive though, at close to $400.00. A one-time charge. That would be on a recurring yearly basis.
As for the ability to buy content (full length movies, and scenes) in a store, networks sometimes put content out in bundles, you can buy content at adultempire, hotmovies, etc. You just need to know what you want. Therefore, enroll at those places and start buying content.
You can even enroll in places where content creators go. Besides OnlyFans and LoyalFans; try Clips4Sale, Manyvids, and I-Want-Clips.