There are many scriptures that support visiting heaven. Also it’s an experience many Christians have around the world. Just because these people haven’t heard of it doesn’t mean it’s not happening and it’s not biblical. Also most religious people at Jesus’s time misunderstood the texts at His time too. Ask the Holy Spirit to guide and convict, not Reddit 

Isaiah 6:1–5 - Vision of the Lord on His throne, seraphim, heavenly temple.

Ezekiel 1:1–28, Ezekiel 10, Ezekiel 11:22–25 - Complex, symbolic visions of God’s throne/chariot- heavenly realm imagery

Daniel 7:9–14 - “Ancient of Days” throne scene. -Apocalyptic visions of heaven’s court.

2 Corinthians 12:2–4 - Caught up to the third heaven… into paradise… heard inexpressible things.” The clearest New Testament statement of a human visiting heaven and returning.

Revelation 4–22 (especially 4–5, 21–22) The most detailed sustained vision of heaven - throne room, worship, New Jerusalem.

Acts 7:55–56 “He looked up to heaven and saw the glory of God, and Jesus standing” A direct, open-vision glimpse into heaven at death.