Looking for the best tips on using Adobe Lightroom when having thousands of photos all located in one folder on your computer.

I want to sort them, categorize them and find a way to easier find old photos when needed. 

So far I have added keyword(s) to all pictures. It looks alright and I can find pictures quickly using a search query.

The pictures are still just thrown into one large folder. I feel a need to have them sorted by year in physical folders as well, but I'm not sure how.

Are there any other techniques I should consider in this situation with Adobe Lightroom 5?