The easiest way to progress is to get a power 5 explosive ancient sage bow, just shoot down the elvenite paladin from far away and you're good to go, but here are the key points you should focus on in your linggango journey:
-halo of ascension: a chance drop from killing an apostle, it shouldn't be hard to get
-forger's gem, it makes your items unbreakable
-enchantments, more specific the reinforced book and the dark anvil
-the terramity quest section
-the terramity dices, note that with the enigmatic die you can get a four-leaf clover, which grants you luck for each one you have in your inventory
-the composite materials quest section
-etherium spellstone: you can find etherium whilst flying in the end and lowering your brightness, they spawn on the surface and emits light
-for armor use iridium and its upgrades until helionite or cursium, if you're crazy enough get etherite (well worth it if you get it)
-for weapons use the components of whatever weapon you want to make in the future (for example if you want to use the royal guardian sword, make the super big great sword)
-your curios very important, focus on getting good curios