Let's game this out:

1) Ukrainian SBU kills Daria Dugina in a car bomb attack (terrorism).

Russia vows revenge

2) Ukrainian SBU (probably) tries to blow up the Crimea bridge using a suicide truck bomber. Even though the bridge is used a lot for military transport, you can see from films (including of the incident) that this is mostly civilian infrastructure, and again a terrorist attack.

Russia vows revenge

3) Ukrainians shell Russian border city power infrastructure in Belgorod.

Russia vows revenge, and starts targeting Ukrainian civilian infracture. In the week since then, Zelensky says 30% of Ukrainian power infrastructure has been hit. Russia has not slowed the attacks.

If Ukraine were to escalate from what they are doing sporadically now to striking Moscow, do think that is going to end well for Ukraine?

If Ukraine is doing exactly the same things that they say are war crimes from Russia, support for Ukraine will not increase around the world. People on the fence about the war will think, "they're both about equally bad" and they will be justified in that position.

Ukraine should use the current situation and their recent battlefield wins in negotiations to end the war. The longer this goes on, the worse for Ukraine.