If you are not mobile, a flojet macerater could help.
If you are close enough to a sewer/septic tank this can pump uphill.
If you are not, and get a portable black tank, put it in the back of a pickup and pump out your tank into it. Then you can drive to a dump station and let gravity drain it.
https://www.amazon.com/Flojet-185550...gateway&sr=8-1