Student Group

Over the past three months, my credit score has significantly decreased, and I'm not sure why. I don't want to pay for another credit report because I already obtained my free one this year. What do you think—could there be a mistake, or may the credit score simply decline? If my credit score declined due to my credit history, is there a quick way to raise it? Could you also tell me what to do if the credit agency made a mistake? Should I dispute the report as is written here https://bytevarsity.com/how-can-a-transunion-credit-report-be-disputed/?