Please make a Quixel Mixer channel, and do not abandon the software. I think the software was ahead of its time, and was buried by all the changes in UE itself. Now that the Educational contents have increased, and the user base to match, it is Now that Mixer would shine.
But it seems common assumption is that the software has seen its last version, so few want to bother to adopt it. If it is stated that development will continue, interest will increase and the tools capabilities will grow.
Please continue with Mixer!