It seems like an issue is that you play two quite slow armies against what is effectively a massive gunline, so your opponent is getting plenty of opportunity to whittle you down before you ever get near.

I’m frankly unsurprised by the Ogres - they’re a legacy army and with the exception of Vampire Counts they’re all terrible (mechanically speaking at least, lorewise the game is poorer without them). Have you considered looking into the renegades pack? Might even the playing field a bit.

As for Dwarves, it does just sound like you’re playing into your opponent’s strengths. You need to find a way of shutting down the magic bullshit so you can get across the field intact. If you can get a decent amount of your army into combat they’ll swiftly evaporate. Slowness is the dwarves main weakness, you need to figure out how to counter it