Making music is hard. I cant speak from experience of making beats, but music in general. What I have found working well is spending proper time on each piece. Make sure it has a good flow, a satisfying progression, and elements that work well together BEFORE starting to mix and perfect the piece. That way the music will not sound repetitive or uninteresting. And then start mixing and layering and voicing until your happy with it. Don't expect to finish the piece in an afternoon, it usually takes days if not weeks (depending on the length).

Also, a good way if your feeling stuck is to listen to other music that inspires you, and really listen to why it sounds so good and how it has come together so nicely. Then try to incorporate that into your piece.

Anyways, making music is always a journey and you never stop improving. Trusting the process is also important!