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3. Search Bioportal or the Ontology Lookup Service
To find if there are already any existing ontologies describing your domain, you can browse different ontology lookup services. Some of them are:
https://bioportal.bioontology.org - to search for biomedical ontologies
https://ontobee.org - ontology search
https://www.ebi.ac.uk/ols4 - EMBL-EBI Ontology Lookup Service
More about selecting an ontology lookup service can be found here: https://faircookbook.elixir-europe.org/content/recipes/infrastructure/vocabularies/Selecting_and_using_ontology_lookup_services.html and about selecting the ontologies and terminologies here: https://faircookbook.elixir-europe.org/content/recipes/interoperability/selecting-ontologies.html
HRI hub involvement in this step
Health-RI can help connecting with previous projects of similar themes.