Not much help but I’m 23 and am in a similar boat (though have a few good bikey mates). I’m going back to uni as even though I’ve got a decent job, it’s mind-numbing and the only other jobs available at the moment are even more menial, require an engineering degree or are high staff turnover sell!-sell!-sell! type affairs. Therefore I’m taking a change of scenery and the opportunity to engage my brain again.
I would agree with cinnamon girl that trying to meet some new biking friends is a good idea, gives you something to luck forward to each week as well as the mood boost from exercise.
Spending some time in the Alps might be a good idea or it might not be, you won’t really earn anything, will have to work silly hours possibly be obsequious to ****holes and might find all your resort mates are merely airheads. Then again, you might make life-long friends, maybe some job connections and have a right old laugh.
TEFL might be a better option, any time spent working in a different culture is useful from an employment perspective and you’ll likely have a better disposable income (in real terms) and work better hours, allowing you to see and do a bit more. If I’d have had my time again I’d have done a TEFL straight from uni, lots of friends had a great time while I just applied for jobs and got depressed.
Good luck with whatever you decide to do, and remember you’re still extremely lucky in the grand scheme of things!