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I am looking for help with finding an alternative to OPB608V.
The OPB706B might be worth taking a look at.
Failing that, it would be helpful if you could supply a bit more information as to what your particular needs and areas of flexibility are in terms of selecting an alternative.
You have already received a suggestion. Besides that, I think TCRT5000 can be a good choice depending on your application. It has a bigger sensing distance. https://www.vishay.com/docs/83760/tcrt5000.pdf
It is widely used in projects like line follower robots:
Line Follower Sensor with TCRT5000 very responsive - Share Project - PCBWay