You need to have at least 550GB of free space (500GB is a minimum meaningful size and +10% overhead on any case).
Please note - the space and bandwidth are used by real people, not machines, thus no predictable income. So, it makes no sense to run a dedicated hardware with such small amount of free space, unless it would be online anyway.
Please, use this Realistic earnings estimator to have an idea how long it may take to fill up the free space and how much you may earn.
Yes, just stop and remove the container,
docker stop -t 300 storagenode
docker rm storagenode
and run it back with all your parameters include changes ones (-e STORAGE in your case). Do not allocate more than 90% of free space for safety.