Visual identity A coherent visual identity is important for people to recognise and position you. Also, to eventually become a fan if they feel identified. General recommendations.
Use your own font. At https://fonts.google.com you can find royalty free fonts that can take part in people recognising you.
At canva you can easily create posters.
For more professional software, you can use the Adobe Software (Indesign, Photoshop, Lightroom). On Lightroom you can create your own presets / filters. So whenever you import an image, it applies it to it. Lowering all the greens and turning on the blues, for example.
Color palette. You can choose a few tonalities that mostly fit the mood of the band. Since it is called violet hour I think it is hard to get out of the violets so.
The element. You can choose one element that always come back and people can associate to the band. For example, a fallen glass of Whisky that is secretly always or often in the images you share. Just on the background, or in a corner. As symbol of “waste” or whatever feeling you would like. Maybe even fits with adrift. Something somehow unsatisfying.
The moodboard. Look for things that inspire you on Pinterest and make a moodboard. This is not to copy for mostly to realise which elements are interesting while you are focused on violet hour in your mind and find interesting color palettes.
Clear:)Starting on the visual identity, one that you can manage yourself. I am going to think a bit and make a list of things. Also, as member of 3voor12 I can submit suggestion for bands. They have their own committee for approval but I can always tip it. Often the send a 3voor12 photographer and writer to the CD releases to check whether it is interesting or not (again, for the long term).