Hi Douglas,
check if you can upgrade your tablet at least to Android 5.0, vendors usually support firmware upgrades to at least the next os version. That should give you more software options.
LineageOS is also a good and tried option and could give you even higher android version. You have to find the right ROM file for your exact tablet model.
And if you feel adventurous and want to try linux, check out the PostmarketOS project (
https://wiki.postmarketos.org/wiki/Devices), maybe your device is supported. Although I have to admit that the installation is not the easiest one...
good luck,
Ondrej