After the initial phases of meme training, you've made it to the big leagues. Here, the memetic energies are so strong, you'll need to wear shades just to see the memes.
Proceed to Phase 5: The Meme Singularity if you're ready for more.
Or, if you're feeling adventurous, try:
Optional Detour: Memeceptional Realms for a side quest.
But, if you're feeling overwhelmed, you can always retreat to:
Phase 2: The Meme Withdrawal for some much-needed meme-asthenia.