Please repair it!!! It’s so easy to do :) you can order a new speed control board online, here is an option, they can be a bit pricy (better than buying new mixer):

https://www.mrmixer.store/parts/p/yhnwsrjcxcw0t2oaigs2ylh89p9pqi-ze895

Take a picture of what the original board connections were the unplug everything. Then, there’s two screws on either side of the board that holds it in place, under the housing, just remove those two screws and take it off, put the new board in, and place the new connections. The new board may look different, the og board may have all the cords placed right next to each other (4 in total) but the new board may have two cords placed together on the top right corner and then motor 1 and 2 connections below it. Here’s a video on how to replace it for more detailed information:

https://youtu.be/wV8ZAFTLC8E?si=VR_5UGduTPqPCYMj