Traditional leveling up, spirit veins, and alchemy.
Yes, the third cultivation method is alchemy, using various elixirs to boost one's cultivation level, like the Purple Mansion Heaven Essence Pill, which grants 100 billion cultivation points or 100,000 Dao points with just one pill. As long as there are enough elixirs, one can rapidly enhance their cultivation level.
While others require centuries or even millennia to accumulate enough to reach Level 300, with enough resources, it can be done in just a few decades.
Su Yu had something to say about this.
