Where can I see all my prior posting on here "Community"?

Posts stay here in perpetuity, but the forum's internal search indexing only "sees" back about three months.

If you need to look farther back than three months, paste this site-delimited search string into your favorite search engine:

site:discussions.apple.com "jonathan.silverman"

If you type the string instead of pasting, be sure to note that there is NO space between "site:" and "discussions."

To find your postings, tap on your name, then select Profile > Subscriptions. That will show them.

This link will bring up all the posts you have participated in recently. It will not bring up older posts though, which Allen Jones has already explained. So feel free to bookmark it:

👉 jonathan.silverman’s Subscriptions - Apple Community

Take care.