just modify the initial space and auto-growth option.

If you right click on your database and select properties, then go to files. You will see the initial size details of your data-file. Just modify this by leaving "actual+20-30GB space" in the initial size of your data or log file. Do it one by one, not all file at same time (ideal time is when full backup is finished).

Then, change the auto-growth in MB instead of %. I will advice to review your database growth and then give sufficient amount of mb in auto-growth as well. Because auto-growth also cause the IO and sometime impact performance when luck is not favoring you. So if you see too much auto-growth then configure with sufficient amount of space (1 gb or 2gb)