only half of our anticipated guests will make it to our wedding

When we first started planning our wedding, we went back and forth between having it in our city or in Spain, where we got engaged. We reached out to our friends, and everyone encouraged us to choose Spain. Now, just a few days before the RSVP deadline, the same friends who were all excited about the destination idea are either not responding, saying they have work commitments, or that they're too busy with their kids. Even my sibling, who just had a newborn, might not be able to make it. I understand that life happens, and I’m trying my best to be an understanding bride. But honestly, I’m feeling a bit lost. We’ve already invested so much, and while I don’t want to cancel, there are still wonderful friends who are committed to coming. I just need some reassurance that a smaller guest list of 30 will still make for a fun celebration, and that us paying $4000 per guest is not crazy for a destination wedding in Spain. Should I scale back some of the activities I’ve planned? If any brides have gone through something similar, I’d love to hear how you managed these feelings. Thank you! 🥺