Seems like the machinery gremlins have been at work on your machine while it has been sitting!!
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I would remove all jumper cables, and ground cable from batteries, just as safety while your hands in tight spots on engine, while trouble shooting problem.
Put a mark on front crank pulley, and if you can, use fan to see if you can roll engine, problem problem is not with engine,if you can’t , remove starter and use bar and roll engine in normal rotation and see how far it will roll ( at least one rev) if it comes up tight ( solid) before one rev, roll it backwards and see if will roll the same amount. If it won’t roll more than one rev, do what you have to, to remove all injectors, then roll by hand, and see if liquid of some kind comes out of injector hole. Then install starter, and gently jog, until no more liquid comes out of holes and engine will rotate very fast/easy.
If it’s water, it is from no rain cap, if coolant- decision time .
Hope this helps. Remember safety protocol when trouble shooting!!