The first thing I would do is remove the aftermarket alarm which are notorious for going bad and put the wiring back to stock. Then I would check fuse #9, 6, 3 and K in the fuse panel under the hood which this guide can help with. I would also swap out the ASD relay in the same fuse panel.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Here are the fuse location and ADS relay in the images below to help you. Also see if the engine runs on starter fluid and please go over this guide:
https://www.2carpros.com/articles/car-not-running-advanced
Check out the images (below). Please upload videos of the engine cranking over in your response to the problem so we can see what's going on and I can tell if the engine is hurt or not.
Images (Click to make bigger)
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Saturday, March 23rd, 2024 AT 6:16 PM