You can try Guitarix for the guitar effects and amp simulation: https://guitarix.org/
Music and audio production
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Nice one. I'll try and see if I can get it up and running with pipewire.
Vital is my favourite synth. It's similar to the popular Serum, but it's free / has upgrade tiers. You can find lots of presets on their forums and discord.
Nice. I love the ability to tweak sounds on the waveform level.
I don´t know if you are interested in using granular techniques, working with sonic grains etc. In case that you are, here is a link to download my comprehensive e-book about granular sound tweaking. I´ll give it away for free: https://www.dropbox.com/s/dj3av5q141ln5zi/In%20the%20World%20of%20Grains.pdf?dl=0 Cheers and peace! Rolf
If you have bitwig, you really don't need much else. Other things can be nice to have, but focusing on new gear/software is a never ending rabbit hole that has a near-complete reduction in productivity at the bottom. Bitwig's included synths, samplers, and effects are WILDLY powerful, and you can do basically anything you can do in any other synth, with few exceptions.
I would focus on trying to make specific things. Like, try to recreate a section of a track you like. If you can't see an obvious way to do a specific part in bitwig, look up a tutorial, or download a sample. That way you'll focus on doing stuff you like, and on learning how to do it better.