Here is another post which is concerned the same topic:

https://www.researchgate.net/post/Guidelines_and_software_to_create_graphical_abstract

ChemDraw is a professional drawing program used to visualize chemical structures and reactions. With this one you can draw rings, bonds, chains, atoms and functional groups, both structurally and in 3D. It is useful especially for chemists and biologists. Many researchers use ChemDraw to create graphical abstracts featuring the main chemical reaction in their work.

My research area i heavy metal, microplastic@Ariful Islam

Dear Md Refat jahan Rakib,

Software to create graphical abstract.

I hope the information will help you.

With Best Wishes,

Samir G. Pandya

There are several options depending on your resources and experience in illustration or design.

If you want something professional you can hire an illustration or figure service in some editorial house (like AJE, Springer, Elsevier, etc) or hire a freelance (I work as illustration my self on www.researchgraphs.com)

Also, you can do it yourself. If your graphical abstract is simple and you have all the components required (like photos or figures) you can use a simple program like PowerPoint to just order it. If your graphical abstract requires to create a new illustration (like represent a molecule, an organ, an individual, etc) you can try to make it yourself using illustration software like Inkscape (free) or Corel Draw (Pay).

I hope this information will help you.