Most enjoyable way of learning data structures and algorithms is to focus on their applications.
For example, start wondering how
E-commerce websites can tell you “people who bought this (whatever you bought) also bought that” which may be of your next interest.
Typing a Dr. in your smartphone shows all doctors in your contacts.
The source code versioning tool knows and highlights only those changes made after check out.
Databases locate records in the table when searching on an indexed field.
Banks, airports, hotels, etc can provide service on priority to their premium customers whenever they walk in or phone in.
Google search works.
Remember, those features seem to execute in a fraction of a second regardless of the size of data or customer base. That is the very essence of data structures and algorithms - do stuff correctly, efficiently and elegantly.