Accidentally invested out of my individual account instead of a TFSA – IBKR

Definitely a beginner here so bare with me. When I first purchased $250 worth of shares of a company on IBKR, I hadn’t opened a TFSA account at that point. I now want to buy another $750 worth of shares of this company but since I can’t transfer positions between accounts, should I continue purchasing the remaining $750 in the same individual account I originally purchased shares of the company in or should I purchase it from the TFSA? I don’t really plan to add anymore over the long term.