The SAT test has an optional essay.
Reasons to take the SAT Essay:
1) Some colleges require or recommend the SAT with Essay.
Check whether your college is included here: https://collegereadiness.collegeboard.org/sat/register/college-essay-policies
Many colleges, including most top schools, most state universities, and most liberal arts colleges do NOT require the SAT with Essay.
2) Some scholarships require the SAT with Essay.
3) You are an excellent writer, even under time pressure.
If none of the above applies to you,
then avoid the stress and skip the essay.