[SquareWheel]

I have ad personalization turned off, but you should be able to view and edit your interests from your settings page.

https://support.google.com/ads/answer/2662856

[seren]

It is mostly empty just my age and sex.

However I am sure I got an interest profile, at least being used with the Discover feed on Android.

[londons_explore]

Google ad data isn't really linked to data for other non-ad services for privacy reasons.

The discover feed on android is mostly powered by web search history, chrome browsing history, and location history. You can see all that here:

https://support.google.com/accounts/answer/162744?hl=en