Well, keep doing the things you have always done and don't be afraid. When our faith is tested it only makes us stronger in our faith, so look for good things ahead in your life with faith. Remain in His Word and in prayer, but just do not give in to the enemy with fear.
Continue with your plans, but if the door closes and you are unable to go on the mission, God will open another door. You have to trust God. We make plans, but God directs our steps.
With these others leaving, perhaps it is a time where God is expecting you to show some leadership ability to others. When things like this happens, we should embrace them and rejoice that God has seen fit to cause us to grow. It's all about growing in faith and love. Show you faith in God and your true trust in Him and His love. You don't really think that He will abandon you, do you? You know He will not.
God bless....
Proverbs 16:9 We can make our plans, but the LORD determines our steps.
Romans 8:28 And we know that all things work together for good to them that love God, to them who are the called according to his purpose.
Romans 5:3 And not only so, but we glory in tribulations also: knowing that tribulation worketh patience; 4 And patience, experience; and experience, hope:
Psalms 46:2 Therefore will not we fear, though the earth be removed, and though the mountains be carried into the midst of the sea;
1 Peter 1:6 So be truly glad! There is wonderful joy ahead, even though it is necessary for you to endure many trials for a while. 7 These trials are only to test your faith, to show that it is strong and pure. It is being tested as fire tests and purifies gold--and your faith is far more precious to God than mere gold. So if your faith remains strong after being tried by fiery trials, it will bring you much praise and glory and honor on the day when Jesus Christ is revealed to the whole world. 8 You love him even though you have never seen him. Though you do not see him, you trust him; and even now you are happy with a glorious, inexpressible joy. 9 Your reward for trusting him will be the salvation of your souls.
James 1:2 Dear brothers and sisters, whenever trouble comes your way, let it be an opportunity for joy. 3 For when your faith is tested, your endurance has a chance to grow. 4 So let it grow, for when your endurance is fully developed, you will be strong in character and ready for anything.