My method is just letting my craptops run a client with scraper and put an autoclicker on it, just let it run for a while on servers with hubs like hypixel and etc.
you'll end up with a shit ton of usernames if you leave it go for a few hours, but all night? gg.
As for cracking the accounts, use a short pass list with secure passwords.
Generic stuff like the eggcrack recommended and the pw lists you are using, are quite weak and not alot of people use those passwords anymore.
I've let my craptops run for about a day [give or take] and ended up with around 100-150 extra alts out of a 2k list.