Information overload usually happens when you keep adding new sources without fully using the ones you already have. The simplest way to avoid this is to let the UPSC syllabus decide what to study and PYQs decide how deeply to study it.

Stick to a limited set of standard resources, revise them regularly, and connect current affairs only to relevant syllabus topics. This keeps preparation focused instead of scattered.
In UPSC preparation, clarity grows when sources are limited and understanding is repeated through revision, not when material keeps increasing.