Higher ph water will help, if you’re sitting at 5.8 and want 6.5, use a ph adjusting solution to raise the ph of the water you are giving your plants, it will raise the ph of the soil as you continue to add the higher ph each time. That being said, don’t do anything silly like dump some 7.5 ph water in there to help adjust it faster. Pick the ph you want you soil to be and adjust your water to that before every feeding. Don’t try and do it in bulk to save time either, i’ve tried doing a few 1 gallon jugs at a time but even after you adjust it with chemicals it will slowly raise back up over time.
I adjust my water to 6.2-6.3 prior to every feeding