The Ordo Favonius must be rescued. It must live, prosper and function for as long as possible. Otherwise, all the idiots and shit-craftsmen of the world who flock there will spread through cities and villages to spoil the lives of normal people.
Kaeya knew this from his own experience. His stepfather attached him to Ordo Favonius precisely because Kaeya showed categorical worthlessness in commerce and manufacturing management, and didn't show a talent for science either. And since Kaeya was an adopted, but still son, his stepfather sincerely made sure that the worthless guy, who was only interested in noisy entertainment, brawls, wine and sex, always had bread and butter, a warm bedroom, a soft bed and good clothes.
Kaeya didn't argue with his stepfather's decision. First, it made it easier for him to be a spy and saboteur sent by Khaenri'ah, Kaeya's home country. Secondly, Ordo Favonius was the only place in the world where Kaeya could get quite good money for simply jet-setting for his own pleasure, without burdening himself with any deeds and efforts. There was no other sweet place like this. The Adventurers' Guild demanded adventure plans, tax reports, guild dues, responsibility for your party members... Even thieves, robbers and beggars need to plan, be careful and responsible, otherwise, they will die of hunger. And Kaeya hated work, responsibility and having to follow plans.
And there were at least a third of such individuals in the Ordo Favonius. The same Lisa, the chief librarian of the Order, is a scientific genius who escaped from the best science city in the world, Sumeru, immediately after graduating from university. After receiving her diploma, she realized that now she needed not only to read all the books indiscriminately in the name of her own mental orgasm and have fun, bringing university teachers to hysteria with questions that scientists have yet to find an answer to but also should work. Moreover, there is a lot of work, and all of it requires scrupulousness, time and effort.
The rest of the knights of the Ordo Favonius were ordinary idiots, good for nothing. If you asked them any question harder than "How much is two plus two?" they answered: "I don't know, the Knights of Favonius Handbook doesn't say anything about it".
Therefore, if the Order is destroyed, all its surviving punk-asses will spread all over the world, and then a real disaster will begin because a lot of punk-asses will survive: fools, as you know, are lucky. This means that Ordo Favonius must live as long as possible.
This truth must be conveyed to everyone who is hostile to the Order, from Khaenri'ah to the citizens of Mondstadt, who every year became angrier and angrier that they had to pay taxes on the maintenance of the knights. Naive people didn't understand that the upkeep of the losers would cost them much more — the Ordo Favonius still trades, although not very successful, but profitably, and therefore pays for half of the upkeep of idiots and loafers.
Besides, Kaeya didn't want to go back to Khaenri'ah. And the point is not at all that the father gave the ten-year-old Kaeya for adoption to one of the richest people of Mondshadat (he hid the treasured blood of his blood from enemies in a comfortable place, and sent a spy to a hostile country with the full approval of the adoptive parent — two benefits at once), and Kaeya already forgot what Khaenri'ah looked like, didn't speak it's language well.
The main thing was that Kaeya could carelessly anneal only in the Ordo Favonius. In all other options, you will have to become responsible, serious and work a lot. And Kaeya, being a member of the Order, instantly and effortlessly rose to the rank of captain and adviser to the grand master, head of all knights. Then it was Varka. And he was a considerable goat. Varka escaped to find the adventures, shifting the responsibility to one of the advisers, Jean, an aristocratic young lady, a native of the noblest family in Mondstadt. The girl didn't shine with her mind, she could not even figure out how to delegate managerial duties to advisers and deputies (which are needed for this!). But who else but a complete fool would agree to lead the Ordo Favonius? Even Varka fled…
However, none of this made it any easier for Keia to save the Order. The fact that, due to Jean's stupidest desire to do every business on her own, no businesses were effectively done, was only one problem, which is ruining the Ordo Favonius. But there was something else. Some hidden force destroying the Order from within. And Kaeya couldn't find it.
And he didn't know if it was worth looking for. Perhaps the Ordo Favonius is simply doomed, and Kaeya is trying to ride a dead horse. If so, you need to look for a new place for a careless free life for your own pleasure. But there were no ideas. And the problem needed to be solved urgently. Kaeya didn't want to die under the rubble of the Order.