There are multiple websites where they publishing data in which column goes more than 100 and 10000 raws.
You can visit Google website
https://datasetsearch.research.google.com/
One following link 🖇️ given to you
https://www.compare-school-performance.service.gov.uk/
Suggestion
Do not search like
data set which contains 100 column and 10000 raws
100 column dataset
Dataset for machine learning
Randomly search like school data University data medical data