In 2017, I made a generic packing list that lives in a note on my phone. Whenever I'm about to travel and have that nagging suspicion I've forgotten something, I pull it up. I haven't forgotten to pack anything since.
Blow dryer · Brush, hair band · Cash, credit card, debit card · Clothes · Computer, charger · Earplugs, eye mask · Face wash, washcloth · Headphones · Jewelry · Makeup · Medication · Pajamas · Passport, license · Perfume · Phone, charger · Q-tips · Razor · Retainer · Skincare (day and night) · Shampoo, conditioner, soap · Shoes · Socks, underwear · Sunglasses · Swimsuit · Toothbrush, toothpaste, floss · Towel · Umbrella · Water bottle · Workout clothes
Make the list. Reference it. Never think about it again.