For level 70 this is your content.
4 easy dungeons. 2 are just upscales.
Instanced Rifts which are just go from point A to B and fight an easy boss.
Fortress Sieges and LFR which are again easy. LFR is literally just one boss that takes no effort.
RNG fragments which can roll completely useless stats for your current spec.
PvP which barely anyone is doing atm.
First actual raids are not coming until the 29th. One is just an upscale of Rise of the Phoenix and will be the actual progression one. The actual brand new one is being made for LFR.
Personally I wouldn't invest in Starfall. It just seems to be getting worse since the launch.