Okay, question for you: how do you typically start the game? What R/Cs do you like? What strategies do you generally use?
If you find ADOM boring, my suggestion would be to stop doing the parts of the game that you find boring
I'm not entirely unserious. If you're finding the early game boring, it's probably because you spend a lot of time grinding. You're spending time getting herbs, or stairhopping for books, or getting crowned, or finding that stupid amulet, or training melee marks with a freaking wizard. These aren't necessary to winning the game, and, in some cases (particularly said amulet), grinding for them actually can involve rather considerable risk to your PC's life beyond just due to boredom. If you just want to win, most of these things aren't that important. They'll come naturally as you level, or they won't.
One option is, if you're finding the early game boring, is to make it harder. Play a thief or a merchant. Doom yourself. Put yourself in a situation where you are fighting for your life, right from the beginning. Or try an Ironman game, or a Carbon Fibre game. Do something you've never done before.
Or take a break. ADOM is forever. You'll be back in some months, or some years, wanting to give it another go.
Hoping to win with every class, doomed. Archer, Barbarian, Bard, Beastfighter, Druid, Elementalist, Farmer, Fighter, Monk, and ULE Priest down.