Simon and Andrew were fisherman. It’s what they knew, liked and and were successful with. Jesus was able to take their profession and use it to His glory. With an analogy He opened the men’s eyes to service.
Jesus can go beyond using analogies. He can use peoples’ professions or hobbies as means to glorify Him:
A carpenter can use their skills to help repair a House of The Lord….
A musician can play in worship service….
A baker can bake food for a homeless shelter….
If you’re struggling with finding some way to reach out to the world look at what God has already given you. Take the talents He has already blessed you with to bring Him glory.