How to sublimate distance fighters?

There are certainly a lot of ways this could be done and some of that is going to depend on what you personally want. Also, I am not a cra, nor have I ever played cra, as such others might have a better idea on what you should do.

Personally, I think the unraveling (epic) sublimation is something you pretty much can't go wrong with provided you have more than 40% crit chance which is easy enough to achieve. This converts all your crit mastery to elemental mastery thus the damage potential should be obvious.

Sentinel (relic sublimation) might also be a good option if you usually attack before moving.

For a different route, you could aim for 100% crit chance using a bunch of influences and critical preparation to get more damage out of your crits occasionally.

Alternatively, just stack a bunch of sublimations that increase damage provided they have conditions you know you will be able to reliably fulfill.

Hopefully this at least gives you some ideas on routes you could take to maximise your damage. But as stated earlier, since I don't play Cra, take this with a grain of salt.