Electrum ore is also plentiful now. Mining in nophica wells and halatali for an hour and you'll have more than a stack. 4 electrum ores turn into 12 nuggets btw so the conversion rate is very good.

Mining at these locations also sometimes give raw gems that you can turn into gems which give about 300xp at L40. These gems can then be kept for later use (L50+ circlets use them and they're not that expensive to make).

As an overview, I think 1.19 actually made it easier for GSM to lvl to 50 compared to a few other crafting classes.