I would say that you must purchase a standing order of 1500VP's. Keep completing your daily and monthly To-Do List. Buy a 100 TCredits order, and use them to participate in auctions. This should give you at least 3000 VP's. That is if you don't have a down line.
If you have a growing down line, then it will be easier for you to collect your matching VP's. That will keep your TL Rank continuously going.