I’d cut out the physical labour entirely. Sell a product, you have the knowledge, ability and experience to sell so that’s what you should do. You could even start a dropshipping store and apply your sales knowledge to the online world. This has very little start up costs and very little time commitment.
Also, employees becoming your competitors is not something you can control, only mitigate. Hell if you treat them well enough you could profit from their business. Employees are still people, just like you and I. They’re influenced, manipulated, spoken down too, motivated, aggravated- just like us. Treat them like a human being and invest in their future (not only the future within the company) and you will come out much better then you left off.
Not many businesses have a process in place to get good reviews and majority of the ones that do are pushy, thus damaging word of mouth.
I think the way to go about it is to simply do a great job and have a small print out that has a QR code to your google review page. You can simply say to the client “if you’d like to leave a review, i’d greatly appreciate it”.
Also, customers don’t generally know about the importance of 5 stars so on your print out you could have something that mentions how appreciated 5 stars are or something like that.
Give your customer the choice and make it easy for them.