RSVP do you do it?

⚪Hula👶👶👶 • left glow for a break. I may come back as some point but for now its taking too much of my time

So my last party I decided to put 'please RSVP so that we know if you can attend or if you can't then we will have room to invite someone else. Thank you for your RSVP by ________

Barely anyone RSVPd in the past I have only had one or two RSVPs but this time I got maybe 10/100.. Not including everyone I called after the RSVP date.

What's your policy?

I always RSVP as soon as I can.

Is there a different way to say it to actually get responses?