only a handful of investigators at most have been assigned to work on the Nord Stream case on a full-time basis.
the perception among investigators is that the will to solve the case is not particularly pronounced in the capital. Politically, it is easier to live with what happened if it remains unclear who is behind the attacks.
Russia now sells oil and gas through Saudi Arabia who sells it to the EU at a sizeable markup. Russia is still selling their gas and oil, just through an intermediary and their economy has been almost unphased despite an initial drop at the beginning of the 2020 offensive. Russia had only money to lose by blowing up it's own oil pipeline, the U.S. has benefited immensely through oil/gas sales to countries affected.
https://www.cnn.com/2023/04/14/energy/russia-oil-exports-iea-report/index.html
https://www.statista.com/statistics/1009056/gdp-growth-rate-russia/
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Stock buybacks and other practices demonstrate that fluffing market numbers when you are allowed to sell stocks can be quite easy as well.