You need to find an outlet for your talent. What good is being able to play if you have no one to play for? Every performance is worth ten practices so performing makes practicing addictive.
Here are a few suggestions:
Find a singer or instrumentalist, put together a one hour program and offer it to nursing homes. Many (here in the USA) pay $100- $300. You could work weekly if you really pursue it.
Join a church choir or seek out a job playing in a church. You'll get to work musically with other musicians, you have deadlines, works to practice, many will be out of your comfort zone at first, you will get to perform and practice with other musicians one or five times a week. Additional income can come from weddings and funerals.
Try to get paying or free jobs playing for community theater. This is very addictive. Many pay but some will abuse a sucker if they come to their door. That can be okay your first or second time. Being involved in community theater is very addictive because it is very social. Professional theater is social, too but, they regulate your hours because they pay. Play for one show and you will grumble for a month because of all the time it takes up but when it is over, you'll be pining for the next one.
Contact your local library and set up a weekly concert series (FREE since it is federally funded (in my country)) and book other musicians (and yourself) to perform. Pick a season to do this such as Christmas (Advent), winter, summer, spring, autumn, Lent, etcetera. I have a friend who does this every Sunday at 2 from January to April. Because of the success of her concert offerings, she is somewhat of a celebrity in town. She is a great singer and actress but is known for these weekly concerts.
Contact your local public access cable station and inquire about performing or hosting a weekly or monthly jam session or something. This is free also because your taxes pay for it (in my country). Since you pay for it, it is free for you to use.
Another great way to learn is to teach. Try it once and you'll discover what I mean. You will quickly know what you don't know, remember what you've forgotten or have to further study something to keep ahead of your students.
Music should be fun. You need to be addicted to it. You have to not want to get up from practicing and look forward to the next time you can sit back down. You can not force this. It must be innate or cultivated. The more you start to learn and if you have performance deadlines you have to meet, and your audience loves you, you will develop that addiction.
This is not a matter of discipline. You must have fun doing it and you must hunger to improve. If you have the hunger and thirst, you will start to drop other things in life to accommodate music and you will only improve as you are challenged more and more. I mean, that's how you got better, your teacher challenged you and assigned more challenging pieces, right? There comes a stage where musicians need other musicians to challenge them.
Who knows, the piano may be a stepping stone for you. You may evolve to become a conductor, organist, director, composer, accompanist . . . Music can open every door in the world to you. You just need to be brave enough to walk through and above all, never say no to an opportunity. Every opportunity leads to other opportunities.
AND, you will never be ready. NEVER. But that is why you have to do it: On the job training. Each time you challenge yourself, you will grow and learn and that is the addiction. Most everyone will admit that college doesn't train them for their career. Doing the job trains them. Like, you can never prepare for a jam session but when it is done, you will know what you know and know what you don't know and want to rush right home and work on it.
Don't be afraid to look into the abyss. It is only you staring back. A better you. Seize the day. Or not. In the words of one of our centuries greatest philosophers, "There is no try, only do." - Yoda.