Feedback regarding my FB Cyclone build

Hello,

I want to make my FB cyclone marauder as strong as possible, but I am uncertain which parts of my build can be upgraded (be it items, skilltree, gemsetup). I can do maps up to t14/15 with all the nasty mods, but some t15 maps/endgame bosses just kill me outright. We can do better :).

If you have any points of feedback I would love to hear that! Especially my gemsetup is weak I think -- any pointers?

https://www.pathofexile.com/account/view-profile/Rivazza/characters

https://www.pathofexile.com/fullscreen-passive-skill-tree/AAAABAECAQDuBIcEswUtBjkJMwthDF8M9xQgFSAZtBo-G5cbrRynIZAj9ipNLOktgy_MMfsyTjWSPAU8LT0PPeI9_D8nQKBHfkjuSshNRk2SUEdRYFOlWGNfP1_QYuxlTWebaPJuqnKpdO14rnk5eu97jHvDfNl9dX7if-ODX4PMhNmE74aziq-NfY-ZkBGiAKOKp22playvrj6vbK-nsKuxs7Xytoq3Pr02vqfAZsC_wYLEFcRYxPbGrsbYypDRNtN-2L3aweDY4izkUelG6dXqEO8O73rvfPAf8i_zBvZI9qP3Mvhf-6r-Cv66