Even if it`s a personal account, you can still target both randomly and according to your interests/hobbies - making money, crypto, fitness, traveling, tech are only a few of the niches you can target.
Post constantly, quality content and work on your bio - that`s how people will know you and will make them follow and engage with you.
Make hashtag research and use them wisely (60-20-20 or 80-20 rule, you can adjust in time).
Search other accounts in your niches of interest, follow and engage, that`s how you create a solid community.
Verify your analytics and adjust your actions accordingly.
Have patience, do all of the above and you will see great results! Good luck with growing your account!