Generally, once you have mentioned a proper or common noun by name, you do not need to name it again until the subject changes. You can use pronouns to refer back to noun forms in previous sentences. This will create cohesion, because it requires the reader needs to think beyond the sentence level, to connect ideas backward and forward. However, always be careful that your pronoun reference is clear – for example, if there are two female nouns in the sentence, it can be confusing to use “she” in the next one. Similarly, this/that/these/those must agree in a singular/plural with the previously stated noun form that they refer to.
Repetition can be effective if the purpose is to emphasize the importance of an idea, but don’t overdo it. Similarly, another thing that can work effectively together with the repetition is parallel structure. See the article on this subject for more information.