I have an older model tractor that after a large rain I can't get it fired up, it almost did the first time I turned the ignition but now it just keeps turnig over but won't crank, I changed the fuel and checked filter, worked fine the other day, could I have fouled a plug, would the motor keep turning over if I did

Remove spark plug wires , and spray some WD40 in them and put them back on and try. If its water the wd will displace it.
Luck

I tried that didn't work its like when I turn the key the motor is spinning but doest sound like it nothing happens I'm getting very frustrated I need some help pn what to do next. Please someone help me

I bought a new plug that's when it just started spinning but nothing happens I'm no mechanical guru but usually it almost fires but now just a continuous spin

Check gap on plug.
Might check compression.if over head valve ,might pull valve cover and make sure valves are moving up and down.
Luck