Good morning!
You are not alone. Apple insists on calling our forum activity "Subscriptions," which has confused many.
Your "subscriptions" are here:
hanyvo’s Subscriptions - Apple Community
which you can bookmark.
The default view is "following." You can change that to "participated" or "authored" using the filter:

That said, posts only stay accessible this way for about three months. For your older posts, use a regular search engine with this site-delimited search string:
site:discussions.Apple.com "hanyvo"
Two notes:
- There is no space between the colon after "site" and the "d" in "discussions.
- Quotes around your username are optional for names with no spaces like yours, but required for ones with spaces, like mine. I included the quotes in the example in case someone else with a similar need sees this.
Also bookmark the site map for the forums: Site Map - Apple Community
Helps with navigation.