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 actually use peoples’ professions or hobbies as means to glorify Him:
A carpenter can use his skills to help repair a House of The Lord. A musician can perform in worship service. A baker can bake food for a homeless shelter.
If you’re struggling with finding a way to minister to the world look at what God has already given you. Take the talents He has blessed you with to bring Him glory.