@siddiq814 what credit specifically are you asking about? any credit would not lower you income, it would lower the tax liability. and as asked, why would you want to do that?
Self Employment credit that reduces my income.
A credit reduces your taxes, not your income. Are you asking about the credit for individuals who could not work due to COVID-19? If so, I don't believe you are required to take it, even if you qualify.
If, however, you are asking about self-employment expenses, you are required to claim these.
what year are you working on? for 2020 there was an option to defer self-employment tax. the deferment was not required. but you need to answer the questions correctly for Turbotax not to defer the tax.
Or are you asking about the Qualified Business Income (QBI) deduction?
In other words, with such little information we don't know the context of your question, so all we can do is guess. You should explain your situation in more detail--including exactly what you are referring to, and why you are asking the question. What is the root of the issue, and what are you trying to achieve?