Changed motor mounts now engine will not crank?

Do you have the battery ground cable connected? Also, did you remove the starter when you did the mounts? If so, recheck the connections at the starter and clean the battery cable ends at the battery. Please go over this guide which should help you figure it out:

https://www.2carpros.com/articles/starter-not-working-repair

and this video as well:

https://youtu.be/6YRW8fyNudY?si=t-Q7AVPD4p5XNAhc

Please go over these guides and get back to us.