PoE PlentyExtension4796 builds

Hello guys, i am playing an RF-Chieftain since leaguestart and i have investet everything into it because its soooo much fun. Now i have come to a point where i dont know what to upgrade anymore. I wont start a new char this league and will spend everything i get into this one but i wont have the currency for mirror tier items. So i thought lets ask the community what i could upgrade to be more tanky and do more damage. Dont get me wrong, i am tanky as hell and i have about 10 mil single target DPS, clear speed is also amazing thaks to hinekora and bereks respite but there i