1. Pick your characters. Choose at most 1-2 characters to have tip-top efficiency, then learn movements, combos, tech, etc. Experiment with realistic situations that you might find yourself in when playing online.
2. Get bodied online. You learn more from your losses than your wins. Find out what kept you from winning a match and train to prevent it from happening again. Ask experienced players to spar with you so that you can get advice from them. Get a LAN adapter to play with power.
3. Watch videos and read guides online. Look at pro matches of your main and emulate their play style. Browse the forums, YouTube, or social media for tech about your main.
4. Attend locals and tournaments if possible. Get comfortable with playing in a crowded environment. Watch how the pros play and learn how they make decisions. If you're lucky, ask them for a game if they're available.
5. Be consistent. Be dedicated. Be devoted. Don't lose your touch, and don't lose your cool. Play and train at a good pace and make sure everything is a learning experience. Zero in on your goal and stay determined to win at all times.
6. Shower. Get some Axe/Old Spice shampoo, body wash, and deodorant. Cover them all over your body until you smell good. Then test it out by going outside and making sure that no birds fall to their demise after smelling you.