If all you can do is crawl, start crawling.
God has blessed each of us with a unique blend of talents and a capacity to love. The amount and level of your abilities is worth little in comparison to your will to develop it and share it with others. Theodore Roosevelt once said “Do the best you can, with what you have where you are.” That is God’s expectation of you.
Whatever you do, work heartily, as for the Lord and not for men, knowing that from the Lord you will receive the inheritance as your reward. You are serving the Lord Christ.