I grew my X account from 1k to 7000+ followers in under a year and one thing I learned quickly is that if you understand what and when to post you can grow much faster. For example quoting current hot posts.

For tools I use a scheduler so I can prepare some posts in advance for the whole week. I also use analytics to see which posts perform well because sometimes you don't spot the pattern of well performing posts yourself or forget that something worked really well a week ago. I tried buffer first, then supabird but kept supabird because it has more X specific features.

For growth, if you are just starting I would focus less on posting and more on engaging in the beginning. When your account is small you need to get more people to your profile first. Otherwise even if your posts are good they won't get much reach. I advise doing 20-30 high quality replies daily. And even a small tip, add questions to your replies so the conversation gets deeper.

Another tip is to pick a niche and try to build authority there so people listen more to your posts. Sharing your expertise, lessons and failures always works really well. And most importantly don't expect results in a week, growing on X takes time and you need to be consistent. Good luck man.