The following discussions deal with the question of how to find a suitable journal:

https://www.researchgate.net/post/Popular_journals_to_publish_dissertations/1

https://www.researchgate.net/post/How_do_you_select_a_right_journal/1

https://www.researchgate.net/post/How_to_select_a_suitable_journal_for_possible_publication/1

https://www.researchgate.net/post/How-do-you-choose-a-suitable-journal-to-publish-your-work/1

https://www.researchgate.net/post/How_to_find_a_suitable_journal_to_publish_your_work/1

https://www.researchgate.net/post/Journal-finder-for-papers/1

https://www.researchgate.net/post/How_do_I_select_best_journal_for_publication/1

https://www.researchgate.net/post/Any_scientific_magazine_you_recommend_in_order_to_publish_an_article/1

https://www.researchgate.net/post/How_to_publish3/1

https://www.researchgate.net/post/I_would_like_to_send_a_paper_for_publication_Where_do_i_send_it/1

https://www.researchgate.net/post/How_to_find_free-to-publish_journals/1

https://www.researchgate.net/post/How_to_choose_a_journal_for_publication2/1

https://www.researchgate.net/post/How_do_you_choose_which_journal_to_submit_a_paper_to/1

https://www.researchgate.net/post/Do_you_recommend_any_bases_for_finding_relevant_journals/1

It can be hard to get your research paper published for free in well-known indexed journals, but there are some good choices out there. Some ideas are given below:

Directory of Open Access Journals (DOAJ): DOAJ is a web directory that lists high-quality, peer-reviewed, open access journals. The community runs it. It includes all of science, technology, medicine, the arts, social studies, and humanities.

PMC is a free full-text archive of biomedical and life sciences journal material. It is run by the National Library of Medicine, which is part of the U.S. National Institutes of Health. This is a great choice for experts in the life sciences and medicine.

arXiv is a free service that lets scholarly writings in physics, math, computer science, quantitative biology, quantitative finance, and statistics be shared and stored online for anyone to read.

Open Research Europe is a site run by the European Commission that lets research articles from any field be published for free. Its goal is to make study results freely available and usable repeatedly.

PLOS ONE: PLOS ONE is not completely free, but it does have a scheme that lets authors who cannot pay the publication fees not have to pay them. It is a well-known open-access magazine that publishes articles in all fields of medicine and science.

Frontiers: Frontiers has many open-access journals in many different areas, and they have a program that lets writers who need money get their fees waived.

These platforms let you publish your study in well-known, indexed journals without having to pay a lot of money. Make sure you look at each journal's specific submission rules and fee waiver policies to make sure they fit your needs.