5’8, 114Lbs, Recipes or Exercises? Lost 6 pounds because of corona.

I’m really skinny, I don’t have fat any places, and I used to smoke weed but I just recently stopped because I believe that’s why I can’t gain. I had corona and lost 5/6 pounds and I’ve been unable to gain weight since then. Any Exercises or Recipes that’s high in protein & calories? SHAKES TOO !