While the options are endless in terms of user research techniques, the best techniques of those we listed tend to be the ones that provide the most information specific to your product. Remote usability testing is among the best options, but that isn’t necessarily the best for every scenario.
If you can narrow down what kind of results a test produces and then configure the test to relate to your product, you can get a lot of powerful data to use without breaking a sweat. These are high-impact, low-effort (and sometimes even low-cost) types of research that anyone can take advantage of.