@Eurvos Morgenbrise
So, you’re similar to me. My switch is recharging so I can’t say for certain, though.
How confident are you at killing a Stalnox? If you go to the shelter at Lookout Landing and explore the cave system there’s one under a pile of rocks, and you can fuse its horn to a weapon for an attack boost of 29 or so. That combined with my Gerudo Sword from my Ganondorf Amiibo got me a 68 attack weapon.
There should also be a Captain Construct III just outside the Water Temple. At least there was for me. Their horns work well, too.
EDIT: At current I have 11 hearts and 2 extra parts of a stamina wheel. My strongest melee weapon (of 13) is 34 and my weakest is 7. My strongest weapon based on non-fused weapons is 16, which is a Zora Longsword with an attack up bonus +8, without bonuses it’s a Strong Zonaite Longsword at 15. My strongest bow (of 9) is 26 and my weakest is 14. How do your weapons compare?
EDIT: Also, Water Temple is a bust. I can only reach one other platform (the others are way too high) and that platform just had some enemies and a metal sphere that you find in shrines, so I think my game is glitched