If you got stuck on a lynel on the way to the final boss, that tells me you were going for the final boss too early. Did you 100% the side quests? Upgrade your armor a bunch?

There’s a colosseum in the depths full of lynels; that was harder for me.

You could always place a warp point as far as you can get into the final boss area, so you don’t have to go through it all again.