Mazraoui was a CM before ETH let him join the first team as a RB option almost right after he took over in january 2018 or something.
He wasn't always great when he did play CM again later, but with experience he seemed to have made several positions his own now, including his old favorite spot, so I can see him being a decent option in Amorim's system.
Licha was DM next to Alvarez in his first Ajax season and honestly pretty great there, basically replacing Frenkie as a more direct and very technical aggressive option there, but while I did really like him there, there was really something to put him next to Timber in CB and then having Alvarez as DM, but basically a 3CB in practice for a lot of the game. That way Licha could add almost the same offensively as he did as DM/CM, while using his aggression in charisma in the back to get a defensively very solid trio, that was also very creative and composed with having both of Timber and Licha there for build up and occassionally running forward, too. Made the De Ligt - Blind pairing look like average footballers, even if De Ligt was more of an imposing defensive force and Blind has his own way of composure and tactical intelligence, but it wasn't weird he basically turned into a LWB there, kind of a Shaw that gets to focus more on being an outlet and occasional playmaker options on the side.
So if Shaw and Heaven own the LCB more, and De Ligt does so for CCB, I think Licha could be a decent option in DM, but his skills also continues to make him a very nice option to keep in the back.
Maz could be an option if Ugarte keeps disappointing, to use his experience to play the 'cover' midfielder role.
Otherwise it gets difficult, perhaps Dalot could be a box to box type, but I can't imagine him improving over Ugarte there. Would basically be Plan F or something.
But amongst the current options I hope Amorim gives (continues to?) Mainoo a chance. And I guess I should also give Bruno and the team as a whole a chance to show "this" midfield works.