You can still use a VPN, right?
Yes. But not a fan of it especially when dealing with crypto-casinos. I don't want to deal with future problems involving usage of VPNs.

However, the reason I am not interested in this challenge is because this is a slot that is very difficult for me to get a good multiplier, even just for 250x it's still difficult.
I didn't know that. Thanks for sharing. Well, now, I guess I really won't even bother trying to play slots provided by Pragmatic Play.

With other providers, for example Hacksaw, getting 250x is not as difficult as in Pragmatic Play, I don't know, that's my experience, maybe other players have different experiences.
Yes. True. I'm a fan of HackSaw Gaming myself since just like you said, they have low volatility slots that usually pays good but of course, in small amounts only.
Just like this one just today on Le Bandit; $0.2 bet, got lucky enough to hit 424x on a free spins round.

They do have high volatility slots, too like Chaos Crew 3, Wanted Dead Or a Wild and SixSixSix, but my pocket isn't that deep enough to venture to those scary slots. lol