If you post/ask a question that includes full names, locations and time frame information, that would be useful toward making connections with earlier generations and with others at Wikitree. Location could include country, county and or city of birth, marriage and or death.
If you go up to Find and click there to open the menu, you can drop down to Surnames. Then, enter your surname. There are a total of 19 St. Croix at Wikitree including you.