I like the way you have listed the ways to earn extra income and was quite surprise that you did not make mention of network marketing, which is a way to make extra income without quitting your regular, though most people view mlm as a pyramid scheme but the real pyramid scheme is a regular 9 to 5, because you can only have one president of a company at any given time and network marketing business model to promote product that can be used is really cheap to join and can offer a substantial extra income or what do you think?
You can select any of the above fields based on your skill sets to create second income source. There is no dearth of opportunities, only thing matter is to identify the right one, which suits you. There is no shortcut to success but you have to start journey from some point. Recession can push your career 5 years back but with proper planning you can minimize its impact and remember Bad Times also don’t last forever.

The financial services industry contributed $809 billion (37% of GDP) and employed 14.17 million people (3% of the workforce) in 2016, and the banking sector contributed $407 billion (19% of GDP) and employed 5.5 million people (1% of the workforce) in 2016.[153] The Indian money market is classified into the organised sector, comprising private, public and foreign-owned commercial banks and cooperative banks, together known as 'scheduled banks'; and the unorganised sector, which includes individual or family-owned indigenous bankers or money lenders and non-banking financial companies.[202] The unorganised sector and microcredit are preferred over traditional banks in rural and sub-urban areas, especially for non-productive purposes such as short-term loans for ceremonies.[203]

  (3) The ratio between the deductions and the gross income is obtained through a U.S. personal income tax calculator [t] and reflect the 2005 income tax rates in the U.S. The federal income tax, social security tax, medicare tax, and state income tax are included. The deductions are taken as the average of the state of New York and the state of Arizona [t], and are representative of married without child status. The deductions on the average wage are confirmed through the average gross and net income of a household in the U.S.
The use of the poverty line of $1 a day had long come under criticism for seeming arbitrary and using poor quality and limited data thus risking an underestimate of poverty. The $1.25 a day level is accompanied with some additional explanations and reasoning, including that it is a common level found amongst the poorest countries, and that $2.50 represents a typical poverty level amongst many more developing countries.
In focusing on your wealth management goals, investment income is obviously critical but you might fund your goals from wider sources of income.  A typical long-term portfolio might produce about half its return as income and the other half as capital growth, though in times of duress the capital growth component wanes.  In this low-interest rate climate, some sources of income have become quite expensive and may prove disappointing against your spending needs.  But by tax efficiently and sustainably drawing income from wider sources, you might meet your goals while more prudently balancing risk against reward.