You'd have to send it to a service which repairs logic boards. Hopefully, whatever component or components failed are ones they can source replacement parts for.
It won't be cheap. But probably cheaper than a replacement motherboard from Apple. Assuming they can repair it. Just be prepared to wait a long time. As it may take months. Due to backlog.
If the part is one they can't source. You may be able to purchase a working motherboard to scavenge parts from. Assuming the data is important enough for the expense. You'd have to talk with them about that.
The most well known is The Rossman Group. I don't know if they are the best. Less known companies may be perfectly capable and able to do the work quicker. But I don't know of any off hand.
We provide Hard Drive Data Recovery in Austin. 100% Upfront Pricing for Apple Logic Board Repair, Data Recovery, and Macbook Repair
www.rossmanngroup.com