You have to pay, unfortunately that's how my bot is running currently. Thankfully it is a lot cheaper since they changed everything, only about $6 usd per month for 1 post every 2 hours, but afaik there's no free workarounds at the moment that won't get your account suspended. If you wanna try it, I think if you use Gimmickbots as soon as you pay for credits in your Twitter developer account it should just start working again but I'm not 100% sure since it seems like there hasn't been any updates from the creator in a while