First, exclude from your mind the option of a possible marriage between a Christian and a non-Christian. In God's eyes this means to break your covenant with Him.

The exception is the situation where in a couple, already married, one of the partners turns to God and the unbeliever wants to continue this marriage. In this case, the Christian partner must not separate from the non-Christian partner. Read 1 Corinthians 7:12-16.

Reduce your relationships with non-Christians to evangelism, friendship at best. And make this clear to all.

Pray to the Lord to prepare the right person for you, someone according to His will. And don't worry if you don't see a possible life partner in your church or community. God, who is faithful and takes care of you, can bring you the right partner from another city or even from another country, just as he did in the case of Isaac and Rebekah.