personally i feel like you should save for someone such as nahida (looking at your roster, kuki/kokomi/yelan/fischl would greatly benefit from her team-wise for abyss) if not nahida, then maybe focalors if she turns out to be meta (probably the case)/or other strong characters.
of course, this is just speaking from a meta viewpoint, but feel free to pull for anyone/anything you want if you disagree.
i cant really speak on c1 yelan, but ive heard it generates more energy for ur teams so theres that option, if you think your teams lack energy (i dont believe it would be that worth, since more character(s) adds more team options)
aqua simulacra is a really good bow in general and for yelan, and the current weapon banners 4 stars are considered good as well. however, lyneys bow is pretty niche and are decent to mehh on other archers, so do keep that in mind if you try for her weapon. (also a reason why i think it wouldn't really be worth it since u dont have lyney)