@aliceelias
We don't know your medical and mental health history, nor your age. We (I) can only pass on your experience and how we handled mental heatlth concerns.

Do you have family living close to you? Maybe reach out to them.
Do you have friends? Reach out and spend some quality time with them.
Like a hobby join a group and enjoy an activity with others liking same and going to find others with similiar interests.
Like to exercise? Join an exercise group or find a YMCA (yes first word is youth but many programs for seniors and all ages). Do you like water aerobics or think you might. I do water aerobics 5 days a week. Totally enjoy doing exercise to music. Met and made many friends there who also love doing this activity and we all enjoy each others company.
Do you like pets? Having a loving dog or cat is really going to left up your depression. Just be aware they do need to be taken care of. But I found the love I give my dog he gives me twice the love back. I was diagnosed with PTSD anxiety/panic disorder and my dog has been designated (Mayo Psychiatric Department) as a PTSD Service dog. He is so much more than that and brings a lot of joy and happines to me.

One of the this with a dog is you have to walk them for exercise. Then you meet other dog walkers who also love their dogs and again you meet others with similiar likes. Not discounted cats. I had one for 18 years and he loved to play. I would play hide and seek with him. I would put him on my bed then run and hide. He would search the house to find me and always did. Sound strange but we both loved doing it that and that is what is important. Find something you like doing with or without others.