WoW

Follow the main questline: The main questline will lead you through the game's story and provide you with experience points for completing objectives.

Participate in dungeons: Dungeons are challenging but rewarding experiences that provide a large amount of experience and loot.

Join a guild: Joining a guild can give you access to group activities such as dungeon runs and PvP battles, which can give you experience points and gear.

Complete quests: Quests can provide you with a significant amount of experience points and help you explore the game's world.

Kill monsters: Killing monsters in the open world can provide you with experience points and loot.

Take advantage of rested experience: When you log out in an inn or capital city, you'll start to accumulate rested experience, which gives you a bonus to experience gained from killing monsters and completing quests.

Use heirloom gear: Heirloom gear provides a bonus to experience gained from killing monsters and completing quests.

Choose a fast leveling class: Some classes are faster at leveling than others due to their ability to kill monsters quickly or heal themselves effectively.

I notice that many players of games with a multi-level system sometimes have difficulties when they can't get from one level to another at all. What about helldivers 2 power leveling boost? You can find out the details at https://leprestore.com/helldivers-2/services/powerleveling/, but in general it's a unique solution for players who need help getting through the game.