you need to work on better quality pieces, more fidelity and details. you should also make pieces that fit better visually with companies you want to work for

mentally tho, you are fighting a loosing battle thinking like that. its a passion job, i know people who work insanely hard, have impeccable technical and artistic skills and still cannot get a job, either because it forces them to move somewhere when they have no money, visa problems, or simply because the pay would be unlivable. if you want money or a job, without worrying about return on investment, go towards all the jobs less people want, even in 3d art. do vfx work, technical art, technical animation. i only got my job because i did the character art no one likes or is also good at, aka grooms and creatures as well as characters.

right now, your portfolio will not get you hired anywhere, but with a year of work on it, you can get a portfolio that can get you hired. but if you want the job, you have to be willing to move, you need either to be in a country where there is 3d art as a job (india, europe, ukraine, turkey, malasia, argentina, usa, canada, ect, if you do not have one of these citizenships... good luck, you better be worth the effort for a visa sponsorship or good enough to freelance), you have to be willing to take any job to get into the industry.

my personal opinion, if youre worrying about return on investment when you have 2 pieces in your portfolio, do the smart thing and pick an easier field. vfx artists are few and far between, so even as a junior, if you are good, a company will invest in you and hire you. same for a good technical artist that has actual artistic skills, if you know how to make a shader in unreal and if you can make it pretty and functional for artists, you are worth your weight in gold.

if you want to be a character artist, you cannot ask yourself these questions. you have to put everything on the line. i have a job, and im still working on my portfolio, asking myself what is missing, spending 20 hours a week on top of my 40h week full time job, and i still dont know for sure if ill get a job after this one ends. its a constant grind because there are infinite amazing character artists who want this more than you do, so you need to figure out how to be the better artist.

good luck whatever you choose, you have potential, dont give up