Small office design help

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I just started working at a small business (not related to IT). I am going to school for cyber security so now I am their IT goto (yay -_-). They recently asked me to look into why their network is slow so often, and intermittently cuts out. I know some networking stuff, but am no pro. I looked over their hardware and services. It seems overly complicated and overkill for what they are using it for in my opinion.

• The business is situated on a single lot with 3 buildings right next to each other not even 100 feet apart. (see pic) There is:

  • a main building with all the offices
  • a second office which is empty but one day wont be
  • and there is a mechanics shop.
  • the second 2 are connected with a warehouse type space

• The main office has 10 users, each with a desktop, and verizon voip phone, the cat 5e cable comes out of the wall into the phone and from the phone into the desktop.

• The internet provider is comcast so there is a comcast modem/router first, which plugs into a verizon router (both of them putting out wifi lol),

• plugged into the verizon router is

  • a meraki which connects to the p2p antenna that shoots internet next door
  • 2 cisco 24 port switches ( it looks like one might be a backup but not sure)

• The 24 port switch goes up into the office

• In the second office the antenna connects to a 24 port switch that is only connected to a small desktop server running the ip cameras.

• That switch is connected to another switch in the same building not doing anything except connecting to yet another switch in the mechanic shop

• The switch in the mechanics shop has

  • lots of poe connections which i believe are for cameras
  • One wifi ap
  • There are only 2 people in the mechanics shop, they only have one desktop and their cell phones.
  • half the ports pull of bird crap

Here’s what I’m thinking.

Main office

• Get rid of the comcast, verizon, and meraki routers
• Get rid of the backup switch
• Put everything in a nice rack with a patch panel (currently on a shelf wired directly lol)
• They don't need backups on backups since all of the data is in GSuite and no critical applications that would suffer from a loss of power or internet
• Add one really powerful router/modem/wifi that can handle all the traffic (should I get separate components for these? like modem, er4 router, and ubiquity ap)

2nd office

• Get rid of both 24 port switches and install one smaller switch that also goes directly to the mechanic shop, with a long cat 5e or fiber?
• Replace the desktop with something nicer

Mechanics

• replace the filthy switch with one of the ones I pulled out of the other office and put it somewhere more protected.
• Wire the desktop directly with ethernet
• Ubiquiti ap

What products would you recommend I replace these with, or tell me if you have a better way to wire it up.

See images for quick diagram and map.

https://drive.google.com/drive/folders/1VADMmCXlyTIVs8jIVcXz7AFtNQjpVXs5?usp=sharing