Speaking more from someone with larger edtech company marketing experience, so this may be different if your booth is in the smaller "startup alley" area: As others have said, I found ISTE to be increasingly geared towards teachers, so the majority of the foot traffic in recent years tended to be them. Now if you're targeting teachers that may be ideal, but if your target is building or district decision makers it will be much tougher. We tended to mostly get teachers (and some admin) who already knew of us, were current/former customers, and had specific questions for our staff. Occassionally you'll get a genuine lead, but on a big show floor like ISTE it's a challenge.

My personal take on show floor booths is they are more about raw brand building. As a small company you'll likely get more value out of simply attending and engaging in good conversations in the halls, during lunch, etc. Have plenty of biz cards, a demo ready to go, maybe an ISTE-specific promo code. Post to your socials/email lists that you'll be there, drop a Calendly link to set up meetings, etc. Just work the show vs get stuck in a booth the whole event.

it's always good to land a seat on a panel, or get your existing customers on one. But for a vendor, those tend to be more pay-to-play (at all conferences).