I'm SS contributor since 2006. I've seen ups and downs, lows and highs and everything in between. The overall long-term trend is unfortunately heading south. This is totally normal due to various factors but most importantly market saturation & massive competition. I said back in 2010-2011, the future of macrostock lies in video and animation content. If you were good in these two segments, the sales numbers didn't suffer that much. Fast forward to 2020 and we can see that even this production went through substantial decline which is once again totally normal. The future of microstock doesn't look so bright ... at least for artists who make living out of it. I've seen way too many contributors who tried to boost sales with increased production efforts....inevitably, everybody reaches the point where their highest possible output is not sufficient enough to keep that income somewhat flat & steady.
For me, it was a great run. I sold a lot of content on SS and I'm definitely thankful for that. Now, it's time to move on and find other business venues and opportunities.