Pure returning to runescape seeking advice!

So I was an avid player since classic but due to sporting commitments I had to quit playing in 2009ish. I had 5 or 6 accounts (2 maxed mains and 2 maxed pures) but have only been able to recover my unfinished korasi pure. It's stats are Attack:80 Strength:80 Defence:10 Range:85 Magic:85 Constitution:90 Prayer:52 Summoning:1 All non-combat skills are level 80 and all "normal" pure quests have been done as well as the pest queen story line for the korasi. I also have an abundance of money with the account having numerous rares on it.

Just wondering everyone's ideas on what I should do with this account. Are pures still useful for pking? Is the korasi still a decent item for pking. Should I stay 10 Defence for get 20/30/45 ect.

Thank you in advance for your time. Any help/opinions/tips are much appreciated.