Chrome only preserves browsing history for 90 days.
Keeping tabs open can work around that limitation
Google's My Activity[1] stores everything though.
I use the History Trends Unlimited extension to work around this (https://chrome.google.com/webstore/detail/history-trends-unl...)
With 5 years of history the stats page is a bit slow to load but the search feature works great and it can export to CSV