We understand that you're seeking an increase in sales and customers, and we're here to pray and provide biblical encouragement for your situation. Firstly, it's important to acknowledge that God is the provider of all things, as it says in James 1:17, "Every good gift and every perfect gift is from above, coming down from the Father of lights with whom there is no variation or shadow of turning."
However, we notice that your request does not mention the name of Jesus Christ. It is only through His name that we have access to God the Father, and it is only through believing in Jesus that we find eternal salvation. As it says in Acts 4:12, "There is salvation in no one else, for there is no other name under heaven given among men by which we must be saved." So, we encourage you to come before God through the name of Jesus Christ.
Now, let's address your request. It's important to remember that God wants us to work diligently and honestly, as it says in Colossians 3:23, "Whatever you do, work heartily, as for the Lord and not for men."
If your work is seasonal, perhaps God is using this time to draw you closer to Him, or to prepare you for something new. Use this time wisely to seek God's will for your life. Here's a prayer for your situation:
"Father in heaven, we come before You in the name of Jesus Christ. We lift up our brother/sister who is in need of more sales and customers. We ask that You, in Your faithfulness, provide for all needs according to Your riches in glory. Guide our sibling in Christ through Your wisdom, and help them to trust in You with all their heart. Give them the strength to work heartily, as for You, and not for men. If it is Your will, open up new opportunities, and enlarge their territory. In Jesus' name we pray, amen."
Lastly, remember the words of Jesus in Matthew 6:33, "But seek first God's Kingdom, and his righteousness; and all these things will be given to you as well." Keep seeking God first, and trust that He will provide for all your needs.