This is going to sound stupid: make more websites.
With my personal website, even as I update my blog posts / add new pages, I took up about 0.01% of my amount of space I had for Neocities. I then started making my website for adoptable Pokemon, and I began to take up even more space! At the time of writing though, im only up to 0.2% of my total space used.
Dont look at your 50GB as a space you *have* to fill, look at it almost like fertile farmland. Its a place of opportunity, a place you'll come to fill up sooner rather than later. Dont treat it as a space you HAVE to fill, else you'll end up filling it only with low-quality fruit.