Hmm, Honestly, my PC library is more expansive, cheaper, and used a lot more than my PS4 library which is a whole lot smaller, expensive and less used. (I don't take advantage of the PS Store that much though).
If there's not many PS4 titles that excite you then just upgrade the PC. I've literally only played BloodBorne for about 3 months on my PS4, and I probably won't touch the thing until DKs 3 come's out so I've basically bequeathed the thing to my little sister to play Spotify tunes and Netflix or whatever.
What kind of games do you play usually?