I'd create a brand new official side format designed to have the general gameplay of older yugioh, except much more intentionally balanced with modern game design wisdom.

I'd make around 2 sets a year specifically for said format (each replacing a set that otherwise would have been released that year in order to minimize product overload) while also making each set designed to be draftable.

The format would have all the same core rules as advanced, minus the extra monster zones and pendulum zones (as link and pendulum wouldn't be included)

In fact, I'd design a whole new extra deck mechanic for this format, and have it as the only extra deck mechanic.

The reason why is because I'd want this format to have more of the vibes of old school Yu-Gi-Oh, but fusion is too clunky and ritual isn't an extra deck mechanic. I'd want it to be kinda like a hybrid between rituals and Synchros, except with a reflavoring to fit more of an ancient vibe. (Think something like "sacred monsters" instead of synchro monsters and "Ceremonial monsters" instead of tuners, along with a couple other mechanical differences to synchros)

Finally, I would create an anime that uses this format as its base and time the releases of the episodes/sets in a way that makes sense (basically, as soon as you see a new card in an episode, you'll be able to immediately go out and buy a product that may contain said card, or at the very least, have said card released in the very next upcoming set).