Comparing the time this post was created and the current date today, you are right in all ways. First you said you made enough gains from DeFi, I think not only you, in fact a lot of people who followed DeFi closely from the time it was highly trending made a lot of money as well. Secondly, as at that time, DeFi was popular and although there were scams but they weren't that much neither was hacks highly heard of, but today, not only has DeFi lost its hype, hackers are now hacking a lot of them, in addition to that is, the higher number of scams. Therefore, considering all these, DeFi is a trend that has ended or almost ending, and very soon another trend is most likely to start.