After submitting your preprint to an Open Access repository of your choice, here is what you can do to decide which Open Access journal to submit your manuscript to. Go to thinkchecksubmit.org and follow the checkboxes:

Additionally, you can copy & paste the abstract of your preprint into the #OpenJournalMatcher to get a list of all the affordable (or even free of APC) journals indexed in the Directory of Open Access Journals that match the focus of your work:

https://ojm.ocert.at/

Useful links