Now that the best time you can have in fgo is approaching (new story chapter), this question becomes a bit more relevant.
How do you go through the story chapters? Do you 3 turn every node? Let dante and skadi handle everything? Hope your friends prepared their herc and cu alter? Maybe you like to use the story support? Do you only use a select few favourites? Or maybe you don’t really pay attention who you bring for the battle?
When I started fgo I made rule for myself to exclusively use the story supports. This made certain battles in part 1 very, very difficult, especially as f2p with a limited squad and who didn’t really wanted to spend time farming embers. But every win felt even more special that way.
My approach changed a bit, i do use friend support now sometimes to run specific playstyles or to play with servants I don’t have but enjoy using (sherlock, hijikata for example).
What didn’t change is that I try my best to use every servant that i raised to max level at least once. (Yes, even jalter). Reasoning is because the story chapters are always the highlight for me in fgo and I want every servant that joined my mc for his journey to participate. It will probably get harder ever new chapter when my roster expands.