The key to success is using the Dragonrend Shout, allowing you to temporarily bring Alduin to the ground.
confirm you haveDragonrendactive and wait for the proper moment to use it.
Hold down Z to use the Shout at its fullest.
If you managed to hit Alduin, a blue glow will appear around him (screen above).
Otherwise, you will have to wait for the Shout to regenerate and hit it one more time.
Therefore you should attempt to succeed with as many Shouts as possible.
Be ready, as Alduin will soon land nearby.
It’s then when you have to start attacking him, at best around his head.
Otherwise, keep at a safe distance and use the most powerful weapons and spells.
Keep attacking Alduin until the Shout’s power wears off and the dragon launches off the ground.
Of course don’t even think that the dragon will be defenceless in the meantime.
Generally, I’d suggest trying to bring Alduin down again as fast as possible.
Don’t forget to regularly use potions and spells, especially if your character got hurt badly.
Keep repeating the above actions until you drain Alduin’s health bar (screen above).
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