Here are the good datasets and ideas for your Tableau Visualization Project:
Project 1: Analyzing global COVID-19 data with interactive Tableau dashboard
Domain: Healthcare, COVID-19
Project 2: Tableau dashboard for analyzing the UK bank customer data.
Domain: Bank customer data
Project 3: Tableau dashboard for analyzing the financial data
Domain: Retail, Finance
Project 4: Tableau dashboard for understanding the agricultural data
If you want assistance to implement these Tableau Visualization projects, check out this Tableau Certification Program by Intellipaat.
You can watch this YouTube tutorial to learn Data visualization using Tableau: