I don't go for any particular color palette (I admire artists who do) but just lean into colors that make my brain happy. Which usually means warmer colors as opposed to cool colors. Muted colors are cozy but I love vivid colors that as well especially as accents or background colors (helps make a character's silhouette pop). I like warm yellow-greens as opposed to blue-greens or turquoise, wine opposed to violet, etc so will often tweak colors to be warmer.

For coloring lineart I also tend to take the color of the lined area and make it darker, more saturated and hue-shift it (usually warmer color but cooler in some cases). Overall I try to balance the values of my art so that it's readable - I like to think I have a good eye for balancing values but sometimes when I'm feeling particularly unsure I'll make the art b&w to check. And for commissions I try to balance colors I like with colors that fit the character/theme, so that everyone's happy!

Some small color methods I like using in my art: mid grey-yellow to emulate a "warm blue", warm mustard as green, changing pure-white to off-white (often a light yellow but sometimes grey or cool blue depending on overall color palette) and pure-black to off-black (dark grey/blue/green), warming all greens/yellows, shifting yellow-browns to orange/red-browns, shifting purple-pink to red-pink...