Upgrading 2015 kona cindercone help

Leeerox

Hi., I’m wanting to know what upgrades would work ie. crank , bottom bracket. Really don’t like current Hollowtech crank so I’m asking if anyone has any info on maybe upgrading from 3x9 to 1x11 and would the xt chainset from Crc work with this bike.? And the current bb is es25 73mm shell so would need m800 bb ,again would this fit?many thanks and look forward to any views as Iv been going round in circles !