You can run the cable along the skirting board

They make em wireless now they calling it WiFi or wirelessfireless or something idk

If I read this correctly, an ethernet cable will not increase your down/up speed from your ISP.

If you can go up in to an attic or down to a basement or crawl spapce directly above or below that floor, that would be the easiest.

If not, drill the walls, put in metal or plastic conduit or other allowable raceway where it is minimally obtrusive to the room ifpossible. Pull bulk calble throught the conduits make sure conduits or other raceway will accomodate all the wiring you need, along with bend radiuses. Look for 40% +/- fill after the cabling is in.

Get an electrician to see the job. They’ll be able to give you estimates for various options, chasing in interior walls, doing a run outside, or possibly in ceiling cavity. They aren’t that expensive.

I’ve used IP-over-AC in the past and it worked well for me. There will be some data loss but it’s a lot less of a hassle to setup. If you own your home though, I’d probably just run the Ethernet cables. If you don’t want to drill holes, run the cables along trim and use coax staples to attach them to the wall or trim.

If you want something that looks good, there are raceways that fit pretty well with the skirting boards and look like they’d be part of them. Otherwise you can tie the network cable to the botton of the wall/skirting board and go in the space under the door. That’s what I did at my place.

One thing though, you were good with wifi before, you should still be good as the cable will only affect your local network, which is also what the wifi does. Unless you’re using your ISP’s router for wifi which you can just get a good access point and use it instead of your ISP’s router for wifi.

If you can’t do it correctly, maybe something like monoprice slim run cables tucked under baseboards? I see you’re in the eu so monoprice isn’t an option but I’d bet there are other places to get slim Ethernet cables. They’re like a spaghetti noodle in thiccness

You could try power line ethernet adaptors instead of cutting up your house with cable.

Also, there’s no right way to do it exactly it depends on your local building codes. For me, if I run cables though any walls it null and voids my insurance policy as it breaks building codes to have anyone other than an electrician do it. YMMV depending on where you live.

Drill a hole, cable is only about 6-7mm in diameter.

I go thru the floor but my house is made of wood and drywall.

Two options, if the house is “double brick” (IE brick wall that has an airspace between, them) drill a hole, and use plates to hide it again.

If its an old thick stone type building, then Google Chasing Brick Wall. The tools are not expensive, but it is messy and requires filling and repair. but its all you can do.

You can chase a double brick home if you want, but its a bit pointless.

https://www.ebay.com.au/itm/115749719205

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https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=p2332490.m570.l1313&_nkw=chasing+tool&_sacat=0

I use Power line ethernet which works via existing electrical cabling. It works great!

https://www.digitaltrends.com/computing/everything-you-need-to-know-about-powerline-networking/

Go up and then come down? What is the ceiling made of?

Up through the ceiling or down through the floor. Alternatively, surface mount on a tacking strip or hidden in molding. Surface mount and molding hidden is good for a couple cables but not for whole trunks. If you’ve got trunk-like wire bundles you’re stuck with the better of ceiling or under the floor (where is there enough space to run the cables you need? You’re still going to have to drill through brick if going under the floor (or be really mindful of wire length). Ceilings usually have a means of going OVER the brick walls but you may not like the drop wires in the rooms you want a wired connection. It’d be a GREAT start for access points though…