Since you did the Starter it should be fine, along with the battery and the cables. Test the relay and also inline fuse links ( 3) ? If all good loosen the starter and wiggle it or take it out and use a large screwdriver and move the starter ring gear some. It may be rounded off teeth locking things up. Look in 3 spots on the ring gear for damage with a good flash light.
You may not have all the cables hooked up correctly. One hanging loose ?
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