is there any way to increase the size of my /var directory under debian 12.7? (flatpak related) - eviltoast

when I installed debian 12.7 I created a separated /var directory, along other 2 separated directories (names forgotten).

I also use flatpak and this program is installed in this directory. Executing ‘flatpack update’ I discovered this directory is 95% full, meaning I cannot update anything, because /var is 95% full (only 400 MiB free)

Ideas to solve this?