SSR Archer

Imo it'll never not be worth levelling an ssr, especially at np2. That said, Gil is basically better than Arjuna in every way, so maybe shelve him for now, wait till you have the time and mats.

Nah,you don't need to level him up right now.You're definitely not short on good archers

I have one Gilgamesh, Chloe and Tristan all of them max ascended and have decent skill level. Guess what? Because it's a freaking Gilgamesh all job can almost be done with just using 1 servant like Boss killing, wave clearing, daily farm, what else be he can't do?
My other Archer often sit on the back bench waiting Gil to be killed, they never got the chance to show up.

For example in this Nero Fest you can destroy almost everything with him (you even grail him to 100.........you beat the game dude) because mostly servant everywhere.
Compared to using arjuna you'll find NP 1 Gil hit harder than him.
Unless you want to challenge yourself don't bother using Gil.

Trust me of when Gil sthrengthening comes to NA, he becomes more Broken.
His tier in JP right now is just like Merlin and Waver.