🤙Getting her number is an easy part. What do you do to keep things interesting in between the first meeting and the first date?

As the title says. I've been getting enough phone numbers along with fucking awesome conversations with really attractive girls who were into me during the dialogue. It was THAT obvious. Yet the thing I currently struggle with is the space between "I just got her number" and "We are on a date". I absolutely have no problem having fun on the dates yet FFS my text/phone conversations end up in me being ghosted. Last 3 examples from this week:

• Last Saturday I got a girls number on a show and I got her home, talking all the time. The very next day, I messaged her and we switched to Telegram. Thinking that I'd love to know her IRL more than over text, my decision was to set up a date. Both of us were super busy this week so the only time when both of us could make it was this Saturday (7 days later). So my exact words were: "Then it's settled. I'm gonna pick you up at 11 a.m. on Saturday" and got a positive response. Meanwhile I thought it would be cool to just chat with her about some usual stuff (so she would remember who the hell I am). Few days go by, she hasn't asked me a single question, did nothing to keep the dialogue going and so on. I feel like I fucked up somewhere in here and I'm trying to understand where. Surely, on Friday she texts me "Your mom and you can come to my concert on Sunday, the entrance fee is $10" or something. I tell her I need to think about it cause it's weird and I ask her if tomorrow date is still up. She responds "No".
• This Saturday, one day after the "no" I see a sexy and cute girl on a street, walking by her mom. We got to chatting, I got her number, I talked to her for like 10 mins and we even got to hold hands. I get home, do some shit around the house and 4 hours after I'd got her number have go by, I decide to give her a call to setup a date (to which she actually responded positively while we were IRL talking). No response. Messaged her the next morning, like "Hey, hope you had a good day off. Wanna talk?" - no response. I'm sure it was her number cause when we were talking I called her so she knows it's me and everything. But I feel like she got a cold feet for some reason. Is calling people cause after you've met them considered rude or smth**?**
• Pretty much the next day, I see another cute girl in a nice dress on a street. I get her insta, she said something like "Don't forget to message me". I surely did and asked her if she enjoys walking and offered her to walk 'n' talk around the neighborhood we live in. Got ghosted on "Read".

Generally, I get a really good feeling that the girl is interested in me while talking to her face to face, yet I feel like I'm fucking up and not understanding why. If anyone could tell me what's wrong, I'd be really grateful