Depending on which Soul you have, you might find it hard to upgrade overmuch. If it’s an earlier, straight steerer version, there’s not much out there that’s higher end.
Otherwise, I guess the obvious question is whether you feel the fork is restricting your riding when it is working properly. If not then servicing it and just riding makes sense to me. The usual thing with middle-ground RS forks is that the rebound circuit’s quite basic and they end up packing down on repeated high speed hits. If that’s an issue, something with a better rebound damper might make sense. Or you could look into upgrading the damper on the fork you have by sticking a better RS damper into it.
All that depends a bit on which fork it it, but swapping Motion Control rebound dampers into RS forks was quite popular a few years back and makes a discernible difference.
If you have a tapered headtube then you have a much wider choice of options mind. You can probably save a chunk of weight too, but again, it depends on whether you think it’ll make a difference.
Don’t know if that’s much help, but them’s my thoughts anyway. Oh, and don’t be down on your Soul, they’re still ace frames. The missus is still riding hers with a Reba up front and loves it.