I started playing this game near end of last season after 2 years of not playing. I am playing thorns crusader and I love it but I can only really do GR 65-66.. I get destroyed in 70 and really want the primal gear unlocked..
By 'getting destroyed', do you mean you have trouble surviving?
The gear and skills look good - I did GR70 for the season 9 journey with pretty much that setup, with only one +250 strength augment and maybe 1-2 ancients more. I was also still using Rubies at that point. Your Heart of Iron only has one socket instead of 3, which means you are missing out on 2 diamonds or 2 rubies, plus additional strength from Finery. Since it's already enchanted, you 'll need to get another one (or an Aquiline Cuirass and put HoI/Sanguinary Vambraces in the cube).
Other than that, there's only minor nitpicks for gear: you could get an augment for your ancient helm, enchant thorns as secondary on your Endless Walker ring and amulet and enchant away your Hack's damage to something more useful. Note also that the punish% on your legs isn't helping very much as it only affects the base damage, without the thorns; you will be better off with all-resist.
The only thing that's left is a question of playstyle. Do you gather large/multiple packs to ensure Akarat's Awakening procs a lot thus constantly refreshing all your abilities? That alone gives you a near-permanent uptime of Akarat's Champion which makes you incredibly tough.
All in all, GR70 should be attainable with minor adjustments.