Only clear way-ahead I see is start your own charter operation and try to get it running to the point where it can run itself for two weeks without you.

That works in any field, not just aviation, but often requires years (decades) of hard work to get there and is risky.

Of if you get well established as an on-call contract pilot, you could probably get away with clearly posting/communicating your availability to manage operator's expectations (if you just turn down calls for no apparent reason, they'll stop calling soon enough). You'd be competing with pilots who will are pretty responsive to the customer.