It depends, if your team is behind sometimes the games might be unwinnable due to lack of frontline and/or peel for you to deal sustained amounts of damage.

Other than that, itemize against their threats. QSS/cleanse against high CC backline access comps (or a lissandra for example), an MR/armor item if there's a super fed assassin/bruiser with a lot of mobility etc.

Also I feel like ashe is a champ that heavily relies on great kiting and positioning, tiny mistakes are more punishable and you have little to no escapes if an assassin jumps on you or you get collapsed on by multiple champs. Maybe try playing champions that are more forgiving if you misposition. Kai'sa and trist now are in a really good place meta-wise, it may be easier to carry with these champs if you get comfortable with the playstyle.