Gnar is my waifu

Evenings gents. I am Gold and play Gnar in the top lane alot cuz he is fun. I wanna hit plat next season but i'm not sure i fully understand adaptive itemization properly enough.

Usually when i rock my yordle buddy out i go for a dmg item first:

Either BC or Tri depending on the tankiness of the oposing team and if i get early lead.

After which i usually check if my team needs me to build tanky, i go ramduins or spirits. Sunfire for extra magic or banshee for bursty AP like diana or Veig in mid.

If my team does not require me to get tanky early i usually go for ghostblade or bork, depending on, again, the tankiness of the other laner.

For boots i go luci if leading, tabi/merc if being stomped or swiftness vs nasus or trynd type slows.

So i look something like BC, yommu, randuins, spirits in a casual build vs tank.

Or Tri, bork/yomuu, randuins, spirits vs non tanky and leading.

At this point, id see if the team needs extra front line/peel or another carry.

I can add frozen mallet for kyting, sunfire for extra arm and magic dmg, warmogs rarely if i feel like it although its a shit item.

Anyway, tips?