Put your accounts in a server.
Paste tokens and an invite. Every captcha on the way in is solved for you, and you pay only for joins that land.
How a join goes
Check
Each token is checked first. A dead or locked account stops there and costs nothing.
Join
The account joins through your invite, and any captcha Discord asks for is solved.
Confirm
A few seconds later the account is checked again, so you see whether Discord kept it.
Joins are spaced out by a delay you choose, because a server that sees a burst of new members can refuse joins for hours. With several invites, each account joins them one after another, and accounts running side by side start on different servers.