Same here. Sometimes, it crashes on a measly 4 GB of RAM.
> (the only thing I'm missing is running Android apps)
I would recommend using Waydroid[1]. It runs fairly well in my use case, and runs LineageOS on top of it with the full LineageOS GUI.
[1]: https://waydro.id/
(They're certainly not my cup of tea though)
I'd be down to replace it with a Chromebook if the model looks and feels as good as the air.
I personally run fedora and do a lot of development, but if I was limited to a Chromebook I could do what I needed and not hate it.
The software was... tolerable, at best, but the support for Linux desktop and Android apps made it much more tolerable than Windows or macOS. That ChromeOS technically represents the fabled "Year of the Linux Desktop" is a depressing thought, but for what it is, it ain't terrible.