Hello!
You have an USB slot. You can put an old USB flash memory there (a little and tiny model not big) and make extroot /overlay to add this USB memory extra space to the router. For example USB is 512Mb, you will have 480Mb extra space for adding plugins, etc…
This is very easy in firmware 3.201 in Luci > System > Mount Points > Add >Select USB Device> /make Overlay >reboot. I have did this with AR750, same space problem after update to 3.201 firmware.
Bye
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