The second batch of silly questions)
1. What are the most popular templates in Multiplayer right now, what is everyone playing? I want something more dynamic and less resource-rich than Jebus Cross. Can you recommend some L or M+u builds with a slight resource shortage?
Well, you answered your own question; there's currently a pandemic: it’s all about Jebus Cross.
Actually, if you want other, more engaging templates, then those are the same m200 builds. But luck plays a very big role there, and it depends heavily on how well you do early game. There's also a template called "balance," but its author is clearly trolling because there's hardly any balance to be found. You can also try "fir tree" for example.
2. I have repeatedly seen the opinion that you need to complete the Gauntlet of Trials (GOT) using Jebus Cross on day 121, and anyone who doesn't make it has missed their chance. Or does this mean that you should strive for this, at least offline, while in a real tournament, things will unfold as they may? In what percentage of games among top players does completing the GOT occur on day 121?
Reaching day 121 in SoD is excellent. Generally, reaching up to day 123 is considered good.
3. Restarts. How to do them, when to do them, is there a topic about this?
За то что нейтралы не бегают за единичкой, для меня это уже стоит того