I second Sarah when it comes to follow topic/s that excite YOU, motivate YOU, attract YOU to do something about it or to just learn more of it.
If you just don't know where to start (we've all been there btw), start with basic DSA problems and solutions (youtube is full with them).
But as soon you understand a bit of the basics, please take a moment, pause, reflect on what you've just learned, and go back to ask yourself "what motivates me?" - "what is the kind of problems I see in the real world?" - now take the minimal version of a problem (e.g.: sorting out traffic lights in an intersection in your city) and plan the simplest solution you can think of, no technologies involved, just pen and paper and a diagram design.
Then take that simple solution to your minimal problem and model the solution using a programming languague of your choice.
Then take that simple solution to your minimal problem and model the solution using functional programming.
Then take that simple solution to your minimal problem and model the solution using an API.
Then take that simple solution to your minimal problem and model the solution using simple cloud resources like AWS Lambda, API Gateways.
Then take the step above and using some declarative infrastructure code (Terraform, Opentofu, Pulumi) try to provision the same components and delete them and provisioing them again.
Then have a look at your previous solution and think how can you automate it as much as possible? from provisioning, configuration until you have your solution up and running
A set of topics YOU are interested to work with are your best allies for your career growth and interviews as well, no one will be able to stop you from growing and the right people will see your motivations right from the beginning and they will want you on their company/team for sure : ) All the best ! 🍻