I'd would like to see something akin to 100% exp and 100% learning bonus as baseline all the time, with some additional bonuses on top of those levels from time to time. It's still require plenty of time invested to rank up to hero and master skills, but this means solo ranking is not nearly so horrible. Simultaneously, throw in some bonus edge incentives designed to keep people invested in long-term characters.

My theory is that this would really encourage more mages and support build that are simply brutal to play right now because there's practically nobody to group with, especially with any RP restrictions.

More magi means more Villagers, more pk and more action in general across the board. Also faster learning means more low-dex dumb races running around that tend to play more aggressively and mix things up (and will still die plenty to the dexy builds). Also this encourages vets to come back and test the waters, everyone to try experimental builds and RP options without demanding 80 hours to get up and running.

Reduce the grind, give edges for those that stick it out and take more risks. PK edges are fine, just do away with the level caps on them.