Hi Katielong4,
It's always challenging to reenter the job market after an absence, but not impossible -- so hang in there! You can create a section for your last four years and include the skills and accomplishments that are relevant to your career goal. This article has more information:
Resume Tips for Parents Returning to WorkWhen you find a job posting that interests you but the requirements don't match perfectly with your experience, you can still apply for the position and emphasize what you
do offer as well as your ability to quickly learn new programs. If you find that job ads frequently request skills that you aren't proficient in, start building your skills now (even through independent study). Your cover letter can explain that you are currently developing your PowerPoint and Excel skills.
Does your resume have a "Qualifications Summary"? If you include a section like this to introduce yourself and highlight your strongest credentials, employers should want to interview you and not be so concerned about the apparent "gap" on your resume.
Wishing you good luck in your job search!