Upgrade advice please stuck around 600

SRS - 217 Headband - 220 Pendant of stealth - Max Arai talisman - Max Mana Shard - 55 Mithrode - 54 Death hex - 10

Those are the levels for my items. I am not sure what to dump into I have about 5k to spend. I get to 600 and it's just slow grinding at that point... If anyone could give some insight. Also I am not that active on the game I check periodically throughout the day. I check it a lot but I don't spend a crazy amount of time on it. So my play style is lazy haha