If you are going to study to get on the same level or more competitive than others looking for jobs you are going to be studying a few years, then end working for someone else.
I would look to offer services to other English speaking Expats.
Just an example:
Property management services, check-in check-outs, property rental portal, bill paying service (a non resident probably can't get a direct debit to pay utility bills), yes the market is flooded with property management/rental agencies but if you do it properly you will be doing it better than many Argentine alternatives.
I have an apartment in Palermo for example and have an agency that manages check-ins & check-out, cleaning etc... but the moment a light bulb needs changing or the clients can't light the boiler; I get an email and need to deal with it quickly- the problem being I don't live in Buenos Aires. I had a management agency that was 'charging by the hour' for doing stuff like this, they had the apartment keys etc, but both times I've called them they didn't answer the phone so had to get other friends in BA to help me out.
Find some property owners that need bill paying service, someone on call to organise repairs, do some check-in/out this service etc, earn some commissions off referrals.
20 clients (with properties in your barrio) x u$s 50 a month bill paying service, once/twice a month property check-up, on call for emergencies = u$s 1000 month, enough to live off...