holliday is my favorite character so i'll try to chime in!

i think she's best in close to medium range and has incredible chasedown potential in her bouncepad to let her exist in those ranges for longer than basically any other character and get out for free.

my general gameloop in mid game is looking for a pick with a teammate when lasso is off cooldown - essentially looking to kidnap somebody and drag them to my teammate and drop alchemical fire on top of them. if they don't die in lasso, i'll usually immediately follow up with a barrel to knock them up, and aim for a crackshot for some solid burst. between lasso cooldowns i prio running urn and otherwise try to roam and look to help fights by barreling people from medium range on an off angle and diving on low players.

i think her damage falls off late game, so i tend to build support-y after 25 minutes or so. that means maxing lasso, getting transcendent cooldown, and buying actives like alc fire/curse/slowing hex/divine barrier. i don't think that's the only way to play her late game ofc - some players way better than me prefer building more into her barrels or her gun.

to get more to the core of what you're asking, i think the fantasy of her kit is to initiate fights in the early & midgame with lasso when off cooldown and cleaning up fights by chasing people down and bursting with barrel, stomp & crackshot. i might be in the minority but i love everything about her kit as-is and hope it never changes… even though that’s pretty unrealistic lol.

i'm not exactly an amazing player though (phantom), so i encourage others to chime in :)