How to fix alkaline soil fast?

I was taking a break from digging out holes for my garlic and found out my soil is SUPER alkaline and garlic will not develop in it. The amendments I searched up (peat moss, sulpher pellets, coffee grounds) all say they are gradual and over time will bring down the ph. Is this thing i would have to do then WAIT until next year to plant? Or will it be okay to plant it now?

I haven't had any success with the few things I have planted in the ground and I think I now know why. I can't afford to get a couple cubic yards of dirt right now. Trying not to be super bummed about this.