There are ways to invisibly or barely-visibly repair knits, of varying degrees of difficulty (largely depending on yarn weight)
Repair What You Wear | How to mend holes in knitwear
barely-visibly repair hole by using needle and thread to carefully gather edges
Knitting Magic | Learn How to Perfectly Repair Holes in Knitted Sweater - Invisible Mending
invisibly repair single row of missing stitches by replacing them, using yarn and needle
NibleNeedles | How to mend knitting like a pro!
invisibly repair multiple rows of missing stitches by replacing them; using yarn, needle, double ended knitting needles, and crotchet hook