Ignore (most) of the other people here. To do this you will need two 10 gig capable switches, since your connection is only as good as the weakest link. You need to take your 5G cable (the side connected to the TP) and plug it into something 10 gig capable (unmanaged would be easiest). Also plug in the cable going upstairs into that new 10 gig switch. Then, wire the 10 gig switch to your tp link one in the garage. Upstairs, replace the switch with something 10 gig capable, then you’re good.
Simple as that. Unfortunately 10 gig switches are not cheap these days, especially ones that are just RJ45, but there are ones that are a limited number of ports.
Ignore (most) of the other people here. To do this you will need two 10 gig capable switches, since your connection is only as good as the weakest link. You need to take your 5G cable (the side connected to the TP) and plug it into something 10 gig capable (unmanaged would be easiest). Also plug in the cable going upstairs into that new 10 gig switch. Then, wire the 10 gig switch to your tp link one in the garage. Upstairs, replace the switch with something 10 gig capable, then you’re good.
Simple as that. Unfortunately 10 gig switches are not cheap these days, especially ones that are just RJ45, but there are ones that are a limited number of ports.