Washer Drain pipe too high - suggestions?
Yes, as @TomG says, take the standpipe up - but I'll modify 18" to "as far as the ceiling or the 8 foot limit allows", that's the least expensive first approach, and if it solves it, you are done. Get it right up inbetween the floor joists.

If a plumber was involved in the black Tee on the white PVC pipe at the top of the picture, the licensing board should hear about it. That thing is dead wrong - it's installed sideways (it's the wrong fitting for the location). I'd expect there might be venting issues with that connection, too.

If merely extending the standpipe does not do it, you need to clean up the lower mess to gain some height (and ensure adequate flow.) That might well involve a plumber (or some advanced DIY plumbing) and some expense, but it would not involve extra complexity and electricity use.