If you find you can't fill 10 pages with plot, that's a sign that you won't be able to fill 250 pages either— you need more things to happen.
Either prior to this or after this, it can help to work out character arcs. What do your people want, how do they change through the book? Ideally the plot provides the elements that make them do so.
Maybe it'd help to share some of my notes for "Diary of the Prose Wars" on a couple characters. These are not great examples but they're what I have on hand.
Note that these two characters are designed to annoy and impede each other, not on purpose but because their personalities and values are so different. Sometimes plotting is a matter of coming up with naturalistic reasons why Character X doesn't get what they want right away.• Enirc - scientist and prose writer - not in Salon.
Voice: that of every Internet debater ever. Pedantic, sarcastic, impatient.
Friend of Reusune, later of Xayu and Wénéš.
Very dedicated to his cause; a bit humorless except for sarcasm. His lack of social skills is no asset to his cause.
Story arc: A prime mover in the agitation for the Salon of Prose, which to Enirc means scholarship. Alienates Reusune when Wéneš seems interested; later wins him back. At the end his cause wins but he is exiled; he’s just not artist material.
• Reusune - Academician in Music.
Witty, hedonistic, amoral. He sleeps with as many of his protégé(e)s as possible, male and female.
Story arc: Sympathetic to Prose, but values connections more and thus disapproves of Enirc’s tactless pivoting toward Wéneš. But is later moved by Mabri’s images and— again calling on connections— helps the idea of a new Salon along.
I suggested you read Forster's Aspects of the Novel, and the chapter on Plot is relevant here. And note, this stuff is hard. Ideally the plot and the character arcs look effortless— things happen, characters change in response, and it feels like real life. But as Forster notes, characters often don't cooperate with the plot, the author has to force things into place. But don't get too agitated about that. The intent of this exercise is to have an arc for each character, and use that to come up with plot points. Whether those are satisfying is a problem for Future You.
Everyone writes differently— some people are plotters, some people are pantsers, i.e. people who work "by the seat their pants", improvisationally and without a plan. But the fact that you got blocked trying to just write, suggest that you are probably not a pantser.