Jesus said that if we want to be first, we need to be the slave of all. In the hierarchy of this world’s system only one can be first. But thank God in His system being first is available to everyone. All of us can be the slave of all.
You may say, “I don’t want to be a slave and certainly not to all.” Jesus said that we are either slaves to righteousness (Jesus), or slaves to sin (satan). There is no middle ground. If we want to know Jesus, we need to follow him and do what he does. And that means serving everyone with unconditional love. And, inviting them to follow Jesus with us (if they so choose).