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Consider:
If you want to expand access to your work, the first step is to determine if your publisher will allow it, and/or if your funder requires it.
Journals that publish entirely open access are known as Gold OA, and those that publish both subscription and open are known as Hybrid. In some cases, you will be charged an author processing charge to publish your article OA, but that is not universal, so check for that when considering where to publish.