You need to create a UKVI account so you can access your eVisa before the 31 December 2024. The service to do this is available now.
Some individuals have already received an email from UKVI with instructions to create an account. From 6 August 2024 the service was made available to everyone, so you no longer need to wait for an email.
You can find out about eVisas and creating your account on UKVI's eVisa page. You can create your UKVI account starting on this page, Get access to your eVisa.
You must continue to travel outside of the UK with your BRP, and it is recommended to do this up to 31 March 2025. From the 1 January 2025 your eVisa linked to your passport will allow to you to travel.
It is recommended to retain the expired BRP/BRC as it may help with future visa applications to stay in the UK, and for your personal records.