You need to be more specific as to what exactly you need help with. There are many factors that can help a content creator grow their channel based on what type of content they make, where the creator is from, what language the content is in, how big or small the channel currently is.
The advice would depend on all of that, there is no one set of suggestions that are universal.
Step 1: Produce watch-worthy content.
Step 2: Use TubeBuddy to guide you through the SEO process.
Step 3: Ask for subs but don't be obnoxious.
Step 4: Stay engaged with your viewers by responding to comments.
Step 5: Stay Positive on your channel.
Step 6: Be Patient.