Develop a referral program. Just like in other businesses, people who are referred by others are easier to convert to a sale than people who weren't, because they're usually coming to you with some interest in buying. Many people you talk to won't be interested in buying right away, but they might know people who are. Happy customers may want to share your product or business. You can develop a referral program to give people incentive to refer others to you. For example, you can give them a 10 percent discount on their next purchase for every new customer they refer.
I believe the ones that don’t make it in the industry (if they chose a good one) don’t give it enough time (like you said they quit before a year is up) and commitment to doing what it takes to grow. I don’t spam FB and only 2 family members order product but I have at least 100+ home school moms making >$2000/mth. Some team members make more, some less. It’s what they put into it (business wise not monetary)
The overwhelming majority of MLM participants (most sources estimated to be over 99.25% of all MLM distributors) participate at either an insignificant or nil net profit. Indeed, the largest proportion of participants must operate at a net loss (after expenses are deducted) so that the few individuals in the uppermost level of the MLM pyramid can derive their significant earnings. Said earnings are then emphasized by the MLM company to all other participants to encourage their continued participation at a continuing financial loss.
Make a decision that you will master this and not give up. Make up your mind to learn and develop the skills to be able to recruit. Make up your mind to pass your fear of talking to people and come out of your shell. Your decisions should be bigger than your fears and insecurities. Even if you are an introvert, make up your mind to make it a priority and do it whenever you choose.