Let's get back to basics. First of all, I infer that you're using test strips to evaluate your water parameters (ammonia, nitrite, nitrate, pH). Strips can be somewhat to very inaccurate. You won't really know what your readings are until you test with a liquid test kit like this one (which most of us use).
If your pH is really that low, there's little chance of achieving a nitrogen cycle. You'll have to modify your pH slowly by modifying your water hardness (GH and KH). This is easily done. (Much easier than softening water and lowering pH.) But we won't know how or how much until you get more accurate readings of your tank.
Until you get your test kit, do only small water changes (10%) every day
. Dose Prime water conditioner by Seachem @ 2-drops gal tank size with every water change. If your pH really is that low, you don't want large wc's to change your pH radically. Prime is ensure any ammonia produced is safely detoxified.
Bbob brings up a good point. You should have a bubbler running and/or a filter splashing in order to oxygenate the water.
Eventually, you may have to get a hardness test to determine you GH and KH. This influences your pH and what measures you might take to raise and stabilize it. Only then can you effectively proceed to cycling your tank.