maybe this list will be inspiration for you as to what you want to use your empty notebooks for since we all must have one.
1.my bullet journal
first and foremost, my bullet journal keeps my life together. in my bullet journal i track my water consumption, write diary entries, create daily to do lists, create monthly calendar setups, track my sleep, use my habit tracker, and generally plan.
2. big dream journal
my big dream journal is where i write diary-like entries on my progress toward large goals
3. lifestyle design notebook
in the lifestyle design notebook i specify goals and the steps to achieving them.
4. foreign language sentence practice
in my sentence practice journal i write at least one sentence pertaining to my day in another language
5. various foreign language notebooks
i take my foreign language notes in these
6. school notebooks
i take notes for school in these