You could disable the bloatware, disabled they won't take much room on the storage.
Settings, Apps, ... choose the bloatware apps for disabling, with some you might to have to remove the updates before you can disable them.
Using the SD card:
Look after these apps that have large data contents saved on storage, helpful for that could be a tool like DiskUsage.
Apps with large data contents like offline navigation usually have the option in their settings to determine their data storage location, so you'd choose your SD card.
For pictures and videos the SD card would be the ideal place, but you'd have to move them manually most times I'm afraid.
Harry