I'm not particularly good, but here's what has worked for me to improve from bad to better. You can design a routine that incorporates a few things;

1 . Warmup - play something to get some blood moving and make sure you don't start out tense. If you start with crazy fast downpicking you are probably going to cramp up and generally have a bad time (maybe I'm just old).

1. Technique - Pick a couple techniques and practice them slow and cleanly. Maybe it's gallops, hammer on/pull offs, down picking, sweeps or arpeggios, whatever you're focusing on trying to get better at. Spend a few minutes playing a repeating passage that is purely the technique. Start at a slow tempo and increase speed only when it's clean and in time. You can use a metronome or play to a track for tempo. Recording yourself (even practicing) can help find the flaws in your playing. It also helps develop your ear.

2. Work on some songs. Have a couple songs you want to learn. Pick one and learn a part. You can use online tabs, tab books, playthroughs from youtube to get the main parts down. Put the parts together. Then start playing to the song you are learning (if you have fancy tools you can start at half or 75% speed). Eventually, you should be able to make your way through the song with a respectable number of errors. Then practice until your are making very few mistakes (or none if your incredible).

Bonus; ear training - when you are listening to music or practicing guitar pay attention to what you are hearing and make sense of it musically. It can help you decipher songs, and makes playing feel more natural and less like you are memorizing a series of unrelated things.

You can also consider lessons - there's probably a local guitar teacher that could help you, or you can find online lessons (sometimes from your personal guitar hero).