Yes, Putin is stupid, his generals are stupid, Duma is stupid, and everybody in Russia is stupid.
Russia is already dedicating almost 100% of their military resources to Ukraine. Russia has already mobilized their defense industry to the max they are able to. Russia is already striking all Ukrainian targets without limit.
There are exactly 3 ways Russia could meaningfully escalate, and none of them are great options as they would generally hurt Russia as much or more than they would help Russia.
Nuclear - I hope it isn't necessary to explain why the backlash Russia would face means this isn't something they will do.
Start attacking countries supplying Ukraine - An even worse option than nukes, because this just increases the number of enemies they have to fight significantly. There wouldn't be a quicker path to defeat for Russia than to do this.
Full mobilization of reserve manpower - This would give Russia a big manpower edge, that they would put to good use, but it comes at a big cost to their economy, including their defense industry production. So they'd get more manpower, but they'd produce less war materials. There would also be a significant political cost as many of the Russian elites are against this, and it would hurt the overall public support for the war. This is the one it is most likely Russia might utilize, and they may resort to it anyway as a means to gain manpower if their current recruitment/coercion methods stop producing the necessary manpower to continue the way.
This is already Russia's full effort and if Russia had a button they could press to "Win the war in Ukraine much faster" they would have already pressed it in late 2022.