Russia has means to end this war faster. She's not using them.
Ah the old Russia totally could beat Ukraine but they are holding back meme. We haven't seen that meme in a while. Most people had given up on the silly argument that Russia is totally involved in a costly 3+ year long war because they choose to be even though they could totally end it at any time if they just "took the gloves off".
The myth that Russia just can't lose wars (even though historically they lose them all the time) has a lot of legs. Even Russian leadership believes it with their ideology of Russian greatness and exceptionalism.
But no, Russia is already doing the most strategic damage they can. They are throwing what munitions they can send against Ukrainian strategic targets; drones, missiles, and glide bombs for stuff a bit closer to the front; and they are not maintaining any stockpile of those. They are using them as they build them and have been increasing production as much as possible. And the death and destruction they are causing is increasing as a result.
The reason they don't fly strategic bombers over Ukraine is because Ukraine would shoot them down.