Help: ADSR invert release

How do I invert the release stage? It seems like my filter starts to reset on the release, and I would like to be able to modify it on an inverted shape. For example, instead of the line going down towards the cutoff, I want it to go up towards the env line.

For reference, I am on lesson 5.

As a follow-up, imagine creating a sound where the pitch bends up at the end or changes shape to increase rather than fade away.