Should I stop? Is it not working well enough?

So I started on the lowest dose and each month moved up to the next dose. 0.25-0.5-1-1.7-2.4. I am on 2.4 now and have been on it for two months. Over the entire time from the start till now I didn't lose anything till I got on 2.4, on the first 2.4 dose month I lost 5kg. And on this 2nd month I lost 1.4kg. Are these results bad? Should I keep going on the 2.4 for a few more months or is this just not working well enough for me? It cost a LOT of money in Australia (Almost $400 AUD) to get this and it's an investment. I wanna get opinions from other users who have been on it. Should I keep going a few more months? Or are my results super poor and not worth it?