The ascensions rewards are permanent

You can get rewards any time, but they were retroactive so plenty of us got what we could out of the way before the anniversary.

It's permanent, so don't worry about it. In fact, you should be doing this even without SQ rewards. More servants to use in case there are events or fights with really strict gimmicks.

It's a good idea to have every servant max leveled, 'cause you never know, when one of them might give an event bonus. (Although it pays to have some low rarity spares at lvl 1, if you plan soloing in a tower event).

It's better to have all of them at their max level, and roll more for duplicates and leave it at level 1 or 25.

Why would i want to leave duplicates?

L1 Taunt servants, mostly. Maybe some other S1 skill like a buff or debuff clear, while equipped with a Tuant CE to get rid of them.

@CharmcasterX We now get those 200 floor tower events once a year, where every servant has a 6-12 hour cooldown. One way to do them is to pair an effective SR or SSR with some lvl1 low stars. They will die fast, leaving your damage servant to clear the rest quickly. That way, you can preserve your other SRs and SSRs for the next couple of quests.

Problem is, for this to work, you need at least 4 lvl1 servants per class.

I know we have a tower next year, did the Japan server get another this year?

And for towers, I'd rather have levelled servants, they are on cooldown by servant ID, so no using multiple copies. If you have a low rarity AoE clear the mook enemies, the stronger servants can do the harder fights every 10 floors.

No tower event this year yet on JP. We may get one, we may not no way of knowing.

Level 1 esports servants worth keeping are Chen Gong, Leonidas, and Georgios since they all have taunt skills at level 1. Level 1 Chen Gong can even NP to clear out someone else if you want to get rid of more servants for some reason or use taunt on someone else if an opponent has some aoe attack he'll die to.

3 SQ per final ascension is permanent, if you ascend someone to final ascension right now that you haven't max leveled you get the 3 SQ popup unless it's a welfare.