To resolve the issue of not being able to fit a piece of blocks in Block Blast, follow these steps:

1. Check for Updates: Ensure your Block Blast app is updated. Developers frequently release updates to fix glitches and improve gameplay. Go to the Google Play Store, search for Block Blast, and check if an update is available.

2. Restart the Game: If the blocks are pre-placed incorrectly, restart your game. This can often resolve embedded issues or glitches that occur at the start of a game session - learn more.

3. Use the Restart Button: If you encounter blocks that do not fit properly, quickly click the restart button. This might help reset the board to a better starting configuration - learn more.

4. Inspect Board Configuration: Sometimes, the game generates a board with blocks already placed in positions that do not allow further placement. Evaluate the board and look for potential gaps where you can place your blocks strategically - learn more.

5. Observe Patterns: Develop a habit of noticing the patterns in how blocks are generated. Make sure to place blocks in a way that maximizes clearing rows and columns to keep the board manageable - learn more.

6. Seek Support from Community: If issues persist, consider reaching out to the gaming community. Platforms like Reddit often have active discussions about gameplay issues where you might find others experiencing the same problem - learn more.

Following these steps should help you troubleshoot the fitting issues you are experiencing in Block Blast.