Eternal suffering in hell isn't in the Bible

Not true.

Take the Lazarus verse. First it’s clearly a parable. But let’s say it is real and it’s literal.

Lazarus would have been in hades being tortured waiting for the resurrection of the righteous and unrighteous at the white throne judgement. Lazarus would not already be in hell.

The land of the dead, hades, gets cast into the lake of fire. So whatever Lazarus would be dealing with would have been in hades, not hell.

Revelation 20:14
New American Standard Bible
14 Then death and Hades were thrown into the lake of fire. This is the second death, the lake of fire.

One thing to also note is that the lake of fire is the symbolism in this verse. That symbolism is then explained just like most parables were done parable first followed by explanation. So the explanation for the lake of fire is that it’s a second death. It’s a second death because the first death is the one we almost all face. Then we all get resurrected. Then those names not found in the book of life gets destroyed in hell.

Acts 24:15
New American Standard Bible
15 having a hope in God, which these men cherish themselves, that there shall certainly be a resurrection of both the righteous and the wicked.

The key to sound doctrine, including in hell , is not cherry picking but systematic theology. Including tracing quotes back to their original source.