I'll go as far as you want, but at this point I suggest taking it to a trusted shop and let them diagnose it.
You are not having a problem with the starting system, a boost is not needed. You are losing spark, fuel and or compression. You saw spark, probably not losing compression that leaves fuel as a likely problem.
Follow the air duct from the filter back to the engine. The screened component is the MAF sesnor, you want to get on the other side of that when you spray.
If it starts after doing this we have only narrrowed down that it is fuel, in which case you are going to need to get a fuel pressure gauge.
Sometimes you are just better off having a shop find and fix the problem.
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Thursday, July 30th, 2020 AT 2:21 PM