Wagering 100$ on slot games is kinda hard too especially if the eligible slot games has a high volatility. You might end up losing more than the amount you can earn on the free spin reward if you not lucky to hit any win on wagering 100$.
The eligible slots really had high volatility. But I was lucky to get some good multipliers by getting the bonus round. I had got a 225× multiplier by getting the bonus round. I also got some 50× to 100× multipliers. It was a lucky journey for me. Although I hadn't won anything good from the 50 free spins. Here is the screenshot of 225× multiplier which I got from the bonus spins when I was playing to complete the wager.

A big congratulations mate, this is an amazing win I must say, been a long time I tried my luck on casino games, I decide to try today but unfortunately, I wasn't as lucky as you were.
At first, I won $0.94 dollar on a bet of $0.2 dollar, I was like, "what a good start" since that was my first spin since several months I played casino games last.
After that first win, I played until my bankroll turned zero, I won nothing anymore.
But I am not deterred though, I will play again later in tomorrow, possibly, might get lucky like you.