But that's the deal... they ARE 'niches'. They don't necessarily translate to being universal. But you can rarely get them to qualify their advice with 'in my area' or with 'with the age crowd I work for', etc..
The thing I have had to decide is, IF the opportunity to DJ more came up, would I be happy doing it? In my case, it would have to be 'Hell no!'. So, putting myself in a position that, if it is successful, I would get a lot more calls to DJ/'play live' works against what I want to do. I mean, if working 24/7 is the only goal, fine. Have at it. If being a musician is the goal, setting yourself up for the 'opportunities' of being a DJ only works against you, IMO.
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An arranger is just a tool. What matters is what you build with it..!