Is this a network switch I can use to light up wall ports?

Hi everyone, not sure if this is a switch or simply a splitter, so I figured I'd ask, and then some background about what we have in this office.

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Here is the image: https://imgur.com/a/MUCrfeT

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We have a single fiber connection coming into our building (there is a horrifically cluttered crawl space closet upstairs where a bunch of old phone and networking equipment is tacked to a wall and much of the wires are simply disconnected, likely due to past private techs just disconnecting and leaving whatever was no longer needed with previous upgrades or changes), it goes to a shitty wi-fi router and the main front desk PC is hardwired from there. Everything else is wi-fi, and our connection is so bad we need to look at hard-wiring everything.

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There are numerous networking ports in our walls, and we are all unclear why nothing was done to keep them lit up, but they aren't functional. So I'm working to determine what of the rats nest in that crawl space is active so that I can test out connections to another (thankfully) marked box that shows the wall connections, there's just nothing plugged into them.

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If this isn't a switch, I assume what I should probably do is invest in a better router, direct connect it inside that closet, then wire it up to the switch and send cabling from the switch to the box marked with the wall connections.

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If it is a switch, I assume I still direct connect the router in that closet, plug it into one of the switch ports (no clue which one to use, which is why it's confusing as to whether it is a switch or not, I figured there'd be an "in" and then everything else is "out"), and then again send cat5e to the box with the wall ports that are labeled.

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Thanks for any thoughts. We're trying to do this in a cost-effective way, and I'm sure that's horrifying to all of you, but we can't afford the several thousand dollars we've been quoted for new fancy wi-fi routers, a new switch, a new firewall, etc.

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We are a small shop utilizing Office 365 for our system and it seems like we have, through that, pretty decent protections in place for our files. We do want to invest in a stronger, new router, however. But I'm not sure we need a Ubiquiti UAP-AC-HD Wave 2 access point with hybrid clouud UC-CK device management, an Araknis AN-110-SW-R-25 switch, and a Sonicwall TZ300 firewall appliance.

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My hope is that closet holds the key to our success along with a new router and some cheap Cat5e cables from FireFold.

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However, while I'm trying to help us save money, I am not at all going to go around pros coming in to assist if that's what it takes. I just also want to ensure due diligence that we aren't buying stuff we don't need.