Perhaps you have tried several different kinds of drugstore liquid foundations but are repeatedly disappointed with the level of coverage you get from them. Before you go all in and splurge on a high-end foundation, take a moment to examine the method you apply your foundation. Do you use your fingers or a sponge? These provide a more sheer coverage, which sometimes is fine, but other times you will want/need more than that. They key to getting really full coverage is to use a brush. A brush with synthetic bristles will not absorb or “rub away” any of your foundation and will give you beautiful coverage.
A foundation brush doesn’t have to be expensive, either:
ELF offers a foundation brush for $1.
AVON has one for $5.99.
You can even use paint brushes from the craft store, which is actually what I do. I get great coverage from a 3/4″ wash brush that came in a set my mom bought for $5. JoAnn has wash brushes on their site in a variety of sizes for $2.49 each. You can also use small shader brushes for your concealer.