There are many alternatives to Audacity for Linux if you are looking for a replacement. The best paid Linux alternative is REAPER. If that doesn't suit you, our users have ranked more than 100 alternatives to Audacity and three of them are paid and available for Linux so hopefully you can find a suitable replacement. Other interesting paid Linux alternatives to Audacity are Harrison Mixbus and Rolling Sampler.
Digital audio workstation for Windows, macOS, and Linux offering multitrack audio and MIDI recording, editing, mixing, mastering, powerful automation, plugin support, scriptable customization, portable installs, frequent updates, and a comprehensive feature set.
A full-featured Digital Audio Workstation (DAW) by Harrison with mixing that mimics the properties of an analogue mixer.
Rolling Sampler is a plugin that can be inserted anywhere and constantly records audio in a loop no matter what your DAW is doing.
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Reaper, while beeing less ressource hungry (totaling to about 15mb portable/installed) has everything you need to start recording and mixing music.
The only thing 'missing' would be sound librarbies to use with MIDI, which most people order seperately for specific content.