I find 4-5 is perfect for me having less than 4 I tend to get bored easily

However I do think it takes hands on experience to master how to 'manage a group' of children so that you can have time to spend individual time with them while still supervising the group...so if this is new for you than you need to give yourself time to 'find your groove' so to speak.

I have been doing childcare for over 20 years ~ my environment is set up to promote self led explorations and engagements to be easy to supervise and I work hard on my crew from the day they start on 'social skills' to work collaboratively and resolve their own conflicts ... this allows me LOTS of time to either be able to be engaged in their play if working on certain skills with them OR to be sitting back just observing and watching them navigate the environment.

Give yourself time to find your groove ~ keep reflecting and trying new things until you find a balance where the kids are engaged and you are able to 'support' rather than constantly having to feel like you are 'leading the circus' so to speak.