>>24788483 (OP)
Keep it on your bookshelf.
Continue buying books and reading them as you please, and put them on your bookshelf when you're done.
When your bookshelf is full, select the books that you know you're never going to read or reference again, and which you also don't care about keeping for sentimentality's sake.
These books are the candidates for removal.
When you finish reading a new book, which you do not have room for on the shelf as is, consider whether this new book is a candidate for removal.
Once you've decided, look among your set of candidates for removal, and remove the book that is the lowest of the low, the one that you're least interested in.
Donate that book to a used bookstore, thrift shop, library, or little free library.
Continue until your bookshelf is full of books that are good and that you are likely to either read again, reference, show off, or at least fondly reminisce about.
Then, buy a second bookshelf so that the process can continue.