WingedKagouti: Hell is the last stop before Hardmode. The Crimson (or Corruption in the worlds with that biome) is meant as the next stop after getting Iron/Silver/Gold gear from underground. The Jungle and Dungeon are after Crimson/Corruption and before Hell.
What you need is either lots of explosives and/or Purification Powder. Either of those will help you remove Crimstone blocks, which you need to do to smash the Crimson Hearths that are at the end of the "fingers" of the Crimson caves. Smashing 3 of those will summon the Brain of Cthulhu, which drops materials you can use to get a better pickaxe (capable of mining Obsidian, Crimstone and Hellstone, allowing you to progress in those areas).
Far out, thank you so much.