What color would be more convenient to dye my hair?

Depends on the tones in your skin .. if you have a warmer skin tone go with a warmer color for hair, a gold brown, maybe a dark orange, or a dark red is also really pretty if you have cool skin do like an ash blonde, or dark brown or a blue black

I have light brown hair and I think adding highlights would do the trick, it changes your hair Tone but at the same time it's pretty subtle

If by convenient you mean easier, then it's always easier to go darker. Going lighter requires that you first bleach your hair.

it is EASIER to go darker. I am in Cosmetology school right now and if you try to go lighter you could damage it, or turn it an orange color. do not try to go more blonde unless you actually know what you are doing.

convent insu really the word, no hair color will inconvenience you, try switching it up though try jet black, it will make you look completely different since your hair is light brown now

copper highlights