It's not necessarily about speaking in tongues or any special gifts. It may not even be about doing good works in church; having humble appearance or speech; preaching or evangelizing.

The mark of the Holy spirit is about the Fruits, not just the gifts of the Spirit. Jesus did say many who exercised great gifts would come in the last day and he'd say to them, "I never knew you, away to Hell!". Matt. 7: 21-23

For instance, the mark of an evil spirit is it makes its victim evil; also the mark of The Holy Spirit is to make a person Holy (again, not necessarily about speaking in tongues, prophesy, etc).

Paul said, "I wish you all spoke in tongues" (1 Cor. 14:5). Which means not all have the gift, and he said the gift of prophecy (to speak in such a way to encourage others) is greater, and it should be more desired.

Hence, the mark of the Holy spirit is to make us Holy in fellowship with Christ. He gives us power to fight and overcome sin. If we truly have the Holy spirit, he'll lead us to hate sin and worldliness.

He'd teach us to Love: loving even our enemies or unlovable people. And to bring glory to God in all things we do. We would start loving what God loves, and hate what He hates.

So if we're not repenting and turning away from the false glory of the world which is rooted in pride, the love of money and sinful pleasures, then we surely don't have the Spirit yet, or we're probably backsliding gradually. And then we need to wake up and get right before Him on time.

May the Lord bless you.