How can I rebuild my career after a 3-year gap and transition into a stable field aligned with my Bachelor's in Electronics Engineering despite having 1 year of experience in a different industry?

Hello, I have done a bachelor's in electronic engineering in 2022 after I was forced to do a job in the petroleum field as a business development executive, which I left because of some personal reasons (TBH: I went into depression). Now I have been unemployed for the past 3 years and am confused about moving forward. How can I explain my 3-year gap to anyone hiring me?