What size of tank do you have? You're not too far off from your goal so it should'nt take much. I would probably remove about 5gals of water from your tank. Pre-mix a fresh 5gals of water with a little higher salinity content (say, 1.026 to 1.02  to compensate for the low level in your tank. Add this mixture to your tank and let it circulate for a bit (maybe 30 minutes or so) then check your salinity level again. If it's still low, repeat the process.
Hope this helps,
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