The cheapest way to look bigger than you are is to repeat yourself. One accent colour, one neutral, one typeface with a bold and a regular weight. Use them on everything, without exception, for a year.
Three colours and four fonts do not look richer. They look like five different companies, and a customer who cannot tell your van from your invoice from your Instagram never builds the recognition that eventually turns into trust.
Boring and consistent beats varied and forgettable every single time.