mastering is very much like cutting your own hair - you might be able to do an OK job with practice, but a professional with the right tools will always be much better. it really depends on what the track sounds like IMO; if you have something with a lot of transients and bass that needs to sound ‘right’ in a club setting i strongly recommend getting a professional to do it.
if it’s more for home listening and you’re determined to do it yourself, as a starting point i’d recommend investing in a high quality versatile EQ plugin - fabfilter pro q 3 is my favourite. it has a useful feature called ‘reference spectrum’ where you can generate a custom EQ curve based on a mastered recording you like the sound of, which can then be applied to your recording to give it a broadly similar tonal balance. then you could use a limiter to raise the RMS level til it sounds right to you - fabfilter pro L is excellent but most DAWs come with one that will do the trick.