I bought “a moment of war by laurie lee” without knowing it was one of 3 books trilogy. What should I do?

So there was this book fest and I liked the vibe the book was giving me so I bought it immediately but now I find out there are 2 others books before this. What do you suggest I should do? (note- I didn't find 2 other books in the fest and I don't have money to buy the other 2 right now)