I've already found another maintainer, and opening orphan requests while I'm still responding to comments in a reasonable timeframe, is clearly stated in the Arch Wiki as not a suitable usecase for orphan requests.

On Thu, 22 Aug 2019 at 18:27, <notify@aur.archlinux.org> wrote:
Elrondo46 [1] filed a orphan request for lxd [2]:

I can manage this

[1] https://aur.archlinux.org/account/Elrondo46/
[2] https://aur.archlinux.org/pkgbase/lxd/