This guide is old, don't use it.
The Draiths got removed (pretty sure), and sadly.
Oh and there's different stats and stuff so you can't do this

Might be a bit incorrect since I haven't done it in a while, but, first, you should get probably around 300 coins and be the Browurag. Why 300? Just for emergencies ;). First, you should eat a few little fish maybe, but head on to the Draith spawn (northwest of the shiprweck), and STEER CLEAR OF THE GW. You should start eating them at their spawn, and you'll grow quickly. At around level 31, you'll be able to inhale them, making it quicker. You'll have to wait a few minutes, but, first, get to level 100. I got to level 150 just to be safe, and went out. Find the Great White. Shouldn't be hard. You should hold the bite button to have the first attack. Then tear it to shreds. Kablammo, you got it. From inhaling all the Draiths though, you'll probably have a lot of coins, so you can be the Great White and destroy everything! Just watch out for Bibos at a low level, you probably can still get swarmed.

Shoutout to SnowWookie for this way. Become a level 52 Goliath Fish, (I don't really know how. Inhaling Bibos?), and then go for the GW's neck, because the tail is harder and more dangerous. The bite damage is enough to kill, but you can't inhale it.

Don't kill yourself right away, hide yourself then change fish. you'll have a string of meat. Go to that place as GW and eat dat meat. I got to level 4 from eating a few fish and my meat line. Steer clear of large groups of fish, or if you become it on multiplayer, steer clear from groups of bosses at a low level.