There is a topic in archive on collecting distributions still supporting 32-bit - it is archived but still a source worth checking.
As noted above you can download the latest xfce for 32 bit on osdn.
And as community 32-bit Arch is still available you can use this guide for mogrifying a 32-bit Manjaro to 32-bit Arch.
An up-to-date 32-bit GNU/Linux Libre (Archlinux base) can be found at