The 4.19.23 Linux kernel has been marked as stable in Gentoo a few days ago and I've just updated my generic kernel configuration file to match it. As with the the 4.14.x configuration I posted a while ago this configuration is based on the Fedora kernel with some Gentoo-specific tweaks. It supports practically every bit of hardware in existence and enables a lot of bleeding-edge kernel functionality. The downside is that building it will take a while and the modules will occupy quite a bit of storage.
To use it install the latest stable sys-kernel/gentoo-sources package (4.19.x), copy the configuration file under /usr/src/linux/ and rename it to .config then proceed to build and install the kernel as usual.