I just got my first 75% discount after 300 hours of playtime, so here I am with 4300 plat not really knowing what to get!

I am mastery 14, with 0 cosmetics. The only maxed arcane I have is Energize ( a friend of mine gifted me the arcane for my birthday, big shoutout lol )

I just got a ton of plat and dont really know what to get :) I mainly want cosmetic, any recommended color palettes or cool skins idk anything!

What would you get with that sum of plat?

Edit: thank you for the advice guys! Your help is much appreciated, warframe has the best community.