The most sustainable and rewarding "tip" is to do good work which is interesting to your peers, and present it well. All other approaches are merely tactics that will only get you so-and-so far. I still include some of them in this answer, since they might be useful to increase your h-index to 10 in a given timeframe.
Self-cite. While a citation record that mainly consists of self-citations might raise some questions, it's an accepted way to get started with building up your record.
Cite other people. Cite active researchers in your field broadly, so they notice you and cite you back. Don't shy away from including multiple references to the same group of authors, so they notice you even more.
Find a "gold-mine" topic. There are some topics that are more amenable for extensions and follow-up papers then others. Once you have such a topic, each new paper allows you to ethically cite and discuss all previous papers in the same line of research.
Spin-off publications. In some fields, it's OK to apply a tactic which is known as "salami publications" in other fields: Publish separate papers which are closely related to another work, for example, a tool or a dataset developed in the context of the work.
An important point is to not overdo it with these tactics. For example, in a book recently published in my field, each chapter contains a reference list with a significant (n>10) number of self-citations. At a certain institute, each PhD thesis contains a separate "Further reading" biography with dozens of references to the institute's papers. I would surely bring such cases up if I was involved in a relevant hiring committee and the topic of research metrics came up.