Hi Marguerite,
5 years is a long time. Why would you want to go back? Also, the fact that they haven’t given you the job back means they have the same question as well. What would stop you from leaving again? This is what they are thinking. If you left badly then you burnt the bridge as well.
I believe you should ask God to reveal to you where you made your mistakes, repent for them and move on. He will provide something else. Unless you have internal connections that can get you back in.
Again, you need to examine your heart and repent before you even try to go back.
I’m praying for you to have wisdom and clarity at this point because I’m not sure it is God’s will for you to go back there. I will also pray for you to get employment, if He opens that door for you to go back there then, Praise God!
Blessings