My advice.
Step back. Relax. Breathe.
What do you want out of the game? There's no right or wrong way to play runescape (yes reddit, you heard me, you can still enjoy yourself inefficiently).
Do you want to delve into the stories? Quests are a good way to go, start with the blood pact and then follow your quest list. Quests are a good way to level and they'll teach you about the game and the world quite nicely.
Do you want to focus on PvE? Then get some gear and go do slayer. Murder creatures in droves and work your way up to the giant mole, then from there expand to other bosses. Try your hand at the elite dungeons in story mode first and then you'll be better prepared for the dungeons proper.
Want a more laid back approach? What's your favourite skill? Do you want to craft your own gear? Mining and smithing (have you heard about the mining and smithing update?) has been reworked, so it's now easier and more engaging to dive in. So you can dive in and craft yourself some decent equipment to make your adventures easier. Want to have a relaxed increase in numbers, try your hand at Manor Farm, Granny's farm is relatively sedate but with some optional complexity in there if you want to create your ideal farm.
Personally I would go for quests. They're fun, engaging, rewarding and they'll help you level your other skills so you can take part in other activities if you'd prefer. But ultimately the choice is yours, RuneScape is vast and there's a LOT of content there, but you don't NEED to focus on efficiency, focus on what you find fun.
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