God will supply all your needs according to His riches in glory, His infinite rich reservoir of resources, in Christ Jesus. (Phil. 4:19) That is a promise but it is based upon your willingness to trust, obey and act on the promise, “Keep on asking, seeking and knocking the door will be opened to you.” (Matt 7:7) I believe there are many corporations, foundations and donor groups that will help retire your debt as long as you are willing to commit yourself for so many years of service in particular areas. Ask the Holy Spirit for guidance and He will lead you to these people.
I was a missionary for nearly twenty years in Nigeria and saw it happen numerous times