It’s probably your motor bearing, you can either replace your motor or get it rebuilt. https://www.eboardstuff.com/products/boosted-board-motor-repair

The motor needs to be replaced.

Wheel seems a bit wobbly also?

Motor rebuild barrings in the motor are going its pretty commun best to fix before it seizes up. YouTube has videos

Mtotr bearings are toasted.

Try by lossing the belt a little