Fellow players, what are a few strategies you use to earn money? I have been doing jobs but the pay is usually less since most of the money I earn is spent in maintaining the sicarios or feeding my pet.

Stealing and selling fert remains one of the most easiest money making markets on the game.

You can make millions per day if quite active, and while crimes such as construction / agave can generally earn more p/h if you consistantly hit the mark, fert robberies remain an easy, quick, and accessible crime from a very early age to maintain and grind. 

Alternatives to that which I have found are buying temporary throwables / points from the NPC market and selling those for a decent markup (you can buy 25 points and also 25 items per day), building / selling properties (town houses or bungalows), or sniping the weed sales on the market when listed below the current drug den prices.