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Buy a new battery?
You can try, after charging it up fully, put it on a lower amp charger for at least 12 hours if not 24 hours without touching it to give it an equalizing charge, this will also make sure that it's absorbed every bit of energy that it can, make sure that the water (distilled water) is up to the correct level both before you do anything as well.
But your bottom line is that your batteries life has been drastically shortened and if you are running it down to 11v then you are running it dead and that is one of the worst things you can do to a lead acid battery, if you only want your battery to last a year then running it to 11.6v (80% DOD) is where you should stop, if you want it to last 2-3 years then only running it to 12.1v (50% DOD) will be ok and is the most common, my deep cycle batteries I only use the top 20% to 30% as much as I can and let it get down to 50% once a week or so and I expect my deep cycle batteries to last 5+ years, I had my charger fail, short out my batteries and drain them dead and I can see the effects still but keeping a close eye on the batteries and charge them fully as often as I can leaving a trickle charger hooked up whenever I can and I check the water once a month.
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