How to set priority on Mikrotik on a certain interface with an unstable Internet channel?

Question

Mikrotik

Hello!
We have: Internet on ether1
My network on ether2 (192.168.10.0/24)
Neighbor network via on ether3 (they have their own router - I gave them only one IP)
It is necessary to make the maximum priority of my network, and neighbors - according to the "residual" principle
T .e.
if my network needs the entire available Internet channel, I take it (well, or almost all) 10Mbit when 50Mbit can work half a day - changing the provider is not an option)
Is it possible to give priority to ether2 right away?