Recently, I tried doing a roll-over on the exchange, but I’m not sure if it’s considered successful—

Here’s my situation: I first closed part of my position, then used the recovered principal to add new positions. So far, in this round of operations, my account has made a little profit. But I’m not sure if this is truly a successful roll-over or if I’ve misunderstood something.

Rolling over sounds like a high-level operation, but it actually seems to be just moving back and forth between positions and costs. Sometimes I see others say they made a lot of money from rolling over, and other times I see people losing badly. So I want to know, as a beginner, how should I judge whether a roll-over is truly successful in actual trading? Should I just look at the profit, or are there other factors to consider?

Could experienced folks give me some advice?