My h-index is very low and I want to increase it
Write papers that people will want to cite. In particular:


When you come up with a new concept/technique, write a good explanatory section, so that people will refer to your paper for in depth explanation.
Make something useful, like a piece of software or a benchmark that people working in your field can use. Write a paper that people using your work can cite. For example, the introductory page of PonyGE2 contains a "how to cite PonyGE2" text.
When you make something people can cite, make it easy to cite it. Include snippets for BibTex and other citation systems that people can easily copy-paste. (BibTex in particular is unpleasant to do entirely by hand; so take that work off your readers' hands.)
Use good titles for your paper, good abstracts and pay attention to the keywords. These things matter a lot for whether people will find and decide to read your paper, and that's necessary to get them to cite it.
Collaborate with a lot of different people in your field. If you write something good with X, chances are X and X's colleagues are going to be citing that paper later on. Also, people looking at X's papers also get to see your paper.
Collaborate with famous people in your field. They probably got famous by being good at it (so learn from the best!), and they get published in the more prestigious journals. That's good for increasing your citation odds.
Write about interesting things that other people will want to follow up on.
Supervise good students, teach them well, and co-author their publications sometimes the student exceeds the master, but the master also gets a boost from the student's success.