What was the apostolic catholic church like before the west-east schism? What was the liturgy like? Prayers...

There was a lot more variation in the liturgical practices of Europe. Instead of there being just about only one Latin Rite, there were several, like the Celtic rites, Gallican rites, and several others now defunct or lost. The West probably looked just as varied as the East does today.

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Something like this I'd imagine.

Nah. It would've been more like this for the Latins.

Not quite true. It's just that we in the West know more about our variation of liturgical practices than we do about the variation of them in the East.

And, as mentioned above, the West took steps to standardize their practices before the East did.

The current somewhat monolithic appearance of the East is primarily due to the constriction under Ottoman mudslime rule.

For example, the East historically had:

we’ve actually had all of those services in our parish and more. pretty awesome tbh

That IS awesome and a blessing.

We've been blessed to see Liturgy of St Basil once, and have experienced the Liturgy of the Presanctified Gifts over Lent many times, and have seen the Bishop serving a few times, which is pretty rare for the US.

Today we attend a Western Rite that regularly serves the Liturgy of St. Tikhon of Moscow. It derives from the Anglican 1892 and 1928 services in the Book of Common Prayer, restored to full Orthodoxy in the 70s. It's based on the Sarum Use of the Roman Rite, a mix of Gallican, Roman, Celtic, and British customs. Standardized in the 13th century (1200s), it was the source for the first Book of Common Prayer in 1549 and was used by Recusant Catholics. Ultimately it derives from the ancient use of the Cathedral of Salisbury prior to the Great Schism.

very cool user, I’ll have to research more about it

Eh, not really.
That's just ecumenical patriarchate influencing everyone loyal to them, and it happened way before islam ruled(the imperial chalcedonians took up the byz rite, while the old-school orientals kept the…well, the rites you can see today in their churches).

Add to that Nikon trying to align themselves(forcefully) with the greeks, intentional and unintentional pruning and standardization, and that's why everyone looks the same in the east, as in the west.

As a sidenote, i'm super sure they also had some cross-influence.
There's a plausible theory that the reason transilvanian orthodoxy looks different than wallachian and moldovan orthodoxy is due to it being built on top of a hispano-galic rite.

And even today, finnish lutherans and romanian roman-catholics sing "Christ has risen" like there's no tomorrow at Easter.