Is there anyway to increase 'App Storage' space on a HTC One X? I'm currently using 6.48GB of 6.76GB 'App storage' on my HTC One X of which 4.95GB is classed as 'other'.

I've seen some guides which suggest methods to extend storage onto an SD card but the HTC One X doesn't have a slot for one.

Is there any way to repartition or something along those lines? Or is it time to upgrade?
You can try :
How I expanded my app storage (repartitioning)

or developing a rom with your requirement.

(delete the unused or etc apps/files from rom)