From what I remember, they recently adjusted crafting so that there’s less need to level ‘every single one’ for cross class skills. There are still quite a lot and I can’t say which ones are most worth getting, but you can generally get the most important stuff like Steady Hand II without them. Personally I have only Alchemist at level 80, Culinarian and Weaver at 70, and everything else is 50 or below, and thankfully haven’t had any issues with it so far. So while having them all levelled is a good advantage, I don’t think it’s entirely necessary if you don’t have the time or would rather focus on just a couple.

You might have already done so but it’s also worth looking at ‘specialisation’ too. I think around level 56 you can choose three crafter jobs to set as ‘specialisations’, which comes with a pool of abilities unique to specialists (abilities are the same for each job) as well as bonuses to craftsmanship and control that can be really helpful

In terms of income I feel like every crafter can generate vast amounts of Gil if you put in the time, so I wouldn’t worry about that and just pick whichever you like the most. In terms of making glamour Weaver and Leatherworker are probably the ideal choices, though for furniture I think Carpenter has the largest variety of items (may be wrong though).