The word "brightly" is often used in writing, but it can become repetitive if used too often. Luckily, there are many synonyms that could be used as alternatives to the word "brightly". Some examples include "luminously", "radiantly", "gleamingly", "shimmeringly", "sparklingly", "brilliantly", and "vividly". Each of these words accurately describes the idea of something being bright, making them great alternatives when you want to add variety to your writing. Being able to use different synonyms will make your writing more engaging and interesting for the reader, so it's always a good idea to have a variety of options in your vocabulary.