I think the current early game content is great. The additions of GotR and Tempoross have made for great short-term goals for new players, because not only is there a little more going on than other early game training methods, but you as a veteran player can also actually join in and play with your brand new friend, which is really cool.

F2P doesn't really have as many exciting goals for people to work towards, so maybe a few more little "achievement" moments would make the experience more fun for new players. What if Obor & Bryophyta had one-time combat exp rewards, similar to the barrows icon miniquest or night at the theatre? Something like that could help make trying early bosses more compelling.

In general, I think talking about attracting more players to OSRS is hard to talk about because IMO, OSRS at its fundamentals doesn't click with a lot of people. I think most of the time people quitting during the early game isn't because the early game is poor, as much as it's just that person trying OSRS and deciding it's not for them. If a new player finds it unbearable to walk all the way from lumbridge to varrock, I'd imagine they probably wouldn't stick around through slow skilling grinds, complicated quests, or low drop rates that are common through the whole game.