There are currently 43 elements in Ninjago lore, obviously he wont unlock some of them until he's strong enough and some just seem a bit redundant to give him, the more op ones will be given to him with time but right now the second element has been chosen, it's more likely to be utilized during the Chunin exams.
Amber
Balance
Brute Force
Creation
Darkness
Decay
Destruction
Earth
Energy
Fear
Figment
Fire
FormFusion
Golden Power
Gravity
Heat
Ice
Kismet
Life
Light
Lightning
Metal
Mind
Misfortune
Nature
Plants
Poison
Propulsion
Quake
Reflex
Shadow
Shockwave
Size
Smoke
Sound
Speed
Surface Tension
Swarm
Technology
Time
Water
Wind
Also the level caps I forgot i removed it in the first chapter so here it is;
1 to 33 — [ Genin ]
33 to 66 — [ Chunin ]
66 to 99 — [ Tokubetsu jonin ]
99 to 132 — [ Jonin ]
132 to 165 — [ Sanin ]
165 to 200 — [ Low Kage ]
200 to 225 — [ Mid Kage ]
225 to 250 — [ High Kage ]
250 to 300 — [ God of shinobi ]
350+ — [ God level ] Shibai
Also I'm going to start increasing the exp he's getting so his level doesn't fall behind his stat levels.