I want to do cloud consulting as side gig. Feels like I am not ready?

So I have a full time job as an SRE but basically functions as cloud engineer. We do server builds, and handling mostly linux servers. I do not do the proper architectural design, but we are always involved with it. Once the design is drafted, we are the ones who are going to implement it. I have 10 YOE in my professional career, 2 YOE as SRE, 1 YOE as sysad, and the rest is handling networks. Needless to say, I have quite an exposure and knowledge in cloud implementations, I have decent knowledge in most AWS services and high level architectural awareness.

I have been planning to add freelance consulting in my gigs in order to grow my income and skill set as well for the long term. I have already set up my Upwork profile but I haven't sent proposals yet. Thing is, every client issues I browse in upwork, it feels like I am not fit to do it. It feels like I know nothing? Does seasoned engineers feel this way too? What do you do if you could not solve/meet the clients needs? Is there a time where you really could not solve their problem? Do you google a lot as well when working with a client? I do not know if this is just an imposter syndrome but, I really want to start. I also feel like Im doing this more for knowledge than for money (at least for now). Appreciate your insights on this!