Every business has problems. Half the battle is acknowledging that something is wrong. The other half is figuring out what it is and to do about it.
Acknowledging involves some type of analysis, measurement for sure. If you don’t measure you are unlikely to figure it out. So, if customer service is bad, talk to your customers. If sales are dropping look at your sales team or what your competitors are doing. Are your priced right? Do you have good relationships with your customers? Is after sales service good? You can’t fix the problem if you don’t understand it.
Once you understand the problem you need to figure out if you have the smarts (experience) to fix it. If you do, then get on with it. If not ask for help with someone who has the expertise.