@collojie, it’s currently unknown when or if there will be new custodial partners. Brave is focusing on on-chain payments, allowing users to receive payments directly without needing custodial accounts.
They are gradually inviting users to on-chain Rewards and aim to roll it out to everyone as soon as possible. However, please note that “as soon as possible” could still take several months or longer as they work on improving the system and fixing errors. For more information, you can check out this post where I provide some official links and give some details: PSA: Current and upcoming changes to Rewards and Creators