1. Start listening to RSBANDBUpdate! weekly once again.
2. I see you have at least a couple level 90s, go and start Player Owned Ports
. From here, over time, you get a series of resources and blue prints. Then you can make the tier 85 tank armour and tier 85 weapons. These should be something you definitely go for.
3. Limit yourself to tier 75 and above for Slayer gear. This means that barrows armour is ok but your best bet is to use either the above mentioned ports armour or tier 80 GWD power armour if you can afford it. Same goes for weapons. Don't use anything under a tier 75 weapon since your combat stats are high. The best and cheapest tier 75 set of items is the abyssal vine whip (made by combining a whip vine with the regular whip) and enhanced excalibur for dual wielding. After you can go for the ports weapons (tier 85) or save for drygores/ascensions/seismics (tier 90, the ranged and magic variants are expensive).
4. Immerse yourself in the lore and quests. These have gone from epic and substantial once or twice a year to almost always being of this caliber. Do them, embrace them, don't do them for just the rewards.
Aside from that just focus on whatever you enjoy. If you enjoyed combat you can do that now with all the various high level critters that were added. If you prefer skilling there are new ways to train that may or may not be incredibly AFK-able.
And if you have any questions, we are always here to help.