SOQL and SOSL are two separate languages with different syntax and use cases in Salesforce. Here are some use cases and examples when you can use SOSL over SOQL:

>  Text search across multiple objects: SOSL is designed for text search across multiple objects in Salesforce. If you need to search for a specific text string across multiple objects, SOSL is the best option. For example, if you want to search for all records that contain the word "Acme" in any field, you can use SOSL to perform the search

> Fuzzy search: SOSL supports fuzzy search, which means it can find records that match a search term even if the search term is misspelled or incomplete. For example, if you search for "Acme" using SOSL, it will return records that contain "Acme", "Acme Inc.", "Acme Corporation", and so on

>  Performance: SOSL is generally faster than SOQL for text search because it uses a search index to find matching records. If you need to perform a text search on a large number of records, SOSL is the best option.

> Retrieving data from multiple objects: SOSL allows you to retrieve data from multiple objects in a single query. This can be useful if you need to retrieve related data from multiple objects. For example, if you want to retrieve all accounts, contacts, and opportunities that match a specific search term, you can use SOSL to perform the search.

> Dynamic search queries: SOSL allows you to construct dynamic search queries at runtime, which can be useful if you need to build a search query based on user input or other dynamic factors. For example, if you want to allow users to search for records based on multiple criteria, you can use SOSL to construct a search query that includes all the relevant criteria

Related: 
https://developer.salesforce.com/docs/atlas.en-us.soql_sosl.meta/soql_sosl/sforce_api_calls_soql_sosl_intro.htm
https://tekslate.com/soql-sosl-difference-examples
https://www.sfdcpoint.com/salesforce/sosl-example-in-salesforce/

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