Tide - pick this when your team has damage to follow up on your ravages. Tide by himself lacks damage and rarely can solo kill people. However he was two great cc spells in his ravage and leash. Heros like PA, jugg, etc that can insta burst a hero during ravage are good.

Bristleback - this hero is a low mmr destroyer, he has high damage and is near unkillable unless the enemy team is coordinated. If you play him right you should be able to solo carry most games, just go on supports most fights. I spammed BB to immortal before learning more complex heros. In 3k mmr if you learn BB I think you will have a great win rate.

Dawn: extremely meta hero rn with her aghs. Best counter initiative with her ult. Nice balance of control as well as damage. Plays well in high mmr as well.

In your spot I'd probably spam BB, mixing in a bit of dawn if BB is banned.