What do you do to stop the counterrevolutions?
I would probably tell Poland to either reenact martial law or face mobilization of Soviet troops that are already stationed in Poland to hunt down the so called “solidarity” terrorists ourselves. Meanwhile, I would tell Hungary to close the borders again under a similar threat. Obviously I would try to prevent another 1956 but those reactionaries involved in that decision must be removed from power.
Meanwhile, at home in the Soviet Union, I would put a stop to Glasnost but probably continue Perestroika by turning it towards the Chinese model.
It was probably too late to save the Warsaw pact and the USSR, but without Yeltsin coming to power and cracking down on the communist party, socialism would have a much better chance of recovering in Russia at least and would be in a much stronger position without going through neoliberal shock therapy. The DPRK could also be in better position today if they had a socialist Russia there to support them during the famine in the 90s.