The article "Effect of Religious and Moral Education Teachers' Subjective Well-being on their Multicultural Teaching Competency and Quality Classroom Instruction
Dear Esther Obeng Thank you very much for your question, it is indeed a relevant and necessary one.
There are a few places where you can obtain a DOI number for your article.
The first is Crossref. The second is ZENODO.
I would recommend ZENODO. It is an international DOI provider. It is also supported by the EU. You can safely obtain a FREE DOI number for all your scientific publications (articles, theses, conference papers, etc.).
However, please read the guidelines carefully. This is because the work you publish here is indexed and stored in the ZENODO infrastructure. You can choose to make your publication publicly visible or customise its appearance to make it private.
Advantages of ZENODO:
1. It is free,
2. It is international and supported by the EU,
3. It is secure,
4. It increases the visibility of your article by indexing it in databases like OPENAIRE,
5. It provides a DOI number quickly.
After registering and logging in to ZENODO, you can obtain a quick and free DOI number for your scientific studies.
If it is a preprint, you may get a DOI from Researchgate, SSRN, Zenodo, and many others easily on the first upload. If it has published already, Zenodo can still be you venue for a DOI. If the article already carries a DOI, Zenodo will ask you to reveal this information. I hope it helps.