I think, as not mentioned yet: try heavy “upwards” compression (what is suggested here to be replaced with heavy boosting into a limiter, but only a real upward compressor will make it sound this clean) …
Or you could do with upward compression, yeah - there is no native solution for upward compression in renoise so You have to pick 3rd party vst - I’d recommend either the one from melda free bundle (mcompressor) or tb red phatt pro and do something like this (process x2 or more to bring up more floor):