This question gets asked a lot, try searching for 'thin sides' etc. Basically the options are keep getting tight fades, apply makeup (can be hairloss concealers like toppik and dermmatch, bigen, ultra thin eyebrow feathering pens to draw little hairs), tattooing (SMP) or wear a full cap. If you don't want to be limited by having to get fades, try something else.