Maitimo settles down in a small village in the south of Valinor. He tells his father he's a little worried he might get bored.
He is not the slightest bit worried he might get bored.
He needs osanwë range and this place is deliberately out of osanwë range of everyone he knows. He eavesdrops. Lots of people, having osanwë conversations, don't take much care to keep them wholly tucked away where only the person they're speaking to can hear them, for the same reason as people have conversations loudly in cafés; he suspects that over time you can get to 'know' someone this way without ever meeting them. It'll take weeks, maybe months, of obsessively stalking the same people until his range on them is long enough for what he needs to do. The war might be lost by then. He stalls his father as long as he can, makes him promise to write letters.
He founds some biology research institutes. He gives his staff permission to watch everything he is doing there very closely; it's all theory, no practical applications whatsoever. He tells them he needs to stay busy, keep his mind off things.
Every hour he spends five minutes on self-injuring on the off chance their marital empathy bond works fine across worlds and this will disrupt Telumë's sleep. It disrupts his sleep too, of course, but Quendi need less of it, and anyway any move that drags both of them down in glorious flames is a win for him.
He tries to learn how to talk to dinosaurs. Tyelcormo can do it. His theory is that it's about being able to distinguish between sensory input that to other people looks indistinguishable; Macalaurë can tell notes of music apart with more precision than him, and presumably Tyelcormo can tell animal thoughts apart with more precision than him, and he just needs to learn how to do it. Dinosaurs are desirable because if you eat people it doesn't matter if they have an amulet giving them a mage-barrier. He needs to assassinate his father and Stef; his father is a higher priority target, not least because assassinating Stef is likely to be the last thing he ever does, and some other things need to happen before his interests are best served by being murdered by Vanyel in front of half this sleepy, small town in Valinor.
He tries to arrange to hook up with people but his guards object, on the very reasonable grounds that no one has any idea how Quendi marriage works these days and what if he ends up married to half of Valinor, with useful sensory blessings galore from it. He tells them that's a good point. He blasts Telumë with lonelylonelylonely and boredboredbored and wantwantwant and he starts to make sense of how dinosaurs think.