o Try recovery in a CD/DVD writer as opposed to a reader. Writers are generally more precise and can see the tracks better.
o If possible try recovery on the same drive that was used to create the disc. Chances of a good read have been found to increase if you use the same drive or at least the same manufacturer.
o If nothing helps you can go to music stores and show them your disc. Such stores usually have a CD refinishing machine and may be able to do a better job.
o As soon as any of the above methods works, don’t think even twice and just create another copy of the disc.
o Buy good quality media.
o Take good care of your CDs
Otherwise, you'll have to try some interesting resources...
Several are listed here:
https://www.repairtoolbox.com/cdfreerepair.html CD Repair Toolbox Free
https://discuss.howtogeek.com/t/how-to-recover-data-from-corrupted-cd-disk/26571
http://www.filerepairforum.com/forum/other/other-aa/cd-dvd-hd-dvd-blu-ray-etc/1391-how-to-recover-cd-files