Best way to make charges for now is to use Siphoning Strike with Profusion II, and Killing Palm with profusion II.
You can also use the Illuson spirit gem.
Or you could farm some temples and hope you hit a Redflare Conduit, it’s a pretty common Unique. If you manage to get yourself a lvl 3 sacrificial chamber, and farm some cultivating orbs, you can scrape off the modifier that shocks you and loops charges down.
If you keep the shock modifier on your roll you can run a utility skill like hand of chayula with commiserate which will remove the shock from you and apply it at a higher magnitude which is a huge damage multiplier.