Maybe you can make a story about a nordic person?
My fanfic here started off as a idea for a mini MC project bc a research projct would be pretty silly to do bc I know too muchabout MC. anyway, that idea tured into a full blown project that will last till the end of high school (not the draft on here ones I won't out on here)
Anyways, the project maybe one that you will go to making sequil after sequil until one day you have 100K words and then one day 1M characters (letters, numbers, symbols, puncuatoin, spaces, ect)\
Hope this works
WARNING IF YOU DO ONE BOOK YOU MAY NOT BE ABLE TO EASILLY STOP
ANOTHER WARNING if you aim to make this as long as mine is youWILL get stuck at some point. You just have to find what gives you ideas. (For me it's watching Simpsons) for you it could be making youtube videos, looking at memes, IT could pretty much be everything. it may be a lot of trial and error to figure it out. (me, I was lucky enough to figure it out first try)but you may not get the luck I did. Try each thing when stuck for 20+ minutes until you find something that works.
also, pro tip. Carry an "Ideas notebook" an notebook you can use to carry with you and jot doen your ideas for your story to use when you need.
Sriy, I mwntioned me so much.
I think this is the longest answer I have ever made