Main router is Jio Fiber default.
Signal strength fluctuates between 20 to 40%
Distance 50-60 feet.
2 walls in between.
Yes main wifi is accessible with mobile.
Wiring is not an option that's why looking for wireless repeater even if speed is slow.
Option 1: prefer physical cable wiring. You can buy cable of 80+ feet and lay the cable. Even if it's across the street it can be done, you probably don't realise thats how fibernet cables now, and earlier TV cables were laid. Cheap and best option.
Option 2: laying cables is impossible. Re-use any old router.
Repeater is not a rocket that has to be built separately, any old cheap router with enough range will do.
Configure the old cheap router in repeater mode and you are done.
Option 3: you don't have any old router.
Buy any router with enough range you need.
Some routers add extra antenna which don't do sh#t. It looks like range is your priority, so search for routers with better range.
Don't fall for costly 'Repeaters', they don't do anything new that normal routers don't do.
5GHz band has a smaller range than 2.4GHz.
So if you need longer range and don't need to worry about speed, check for routers which have 2.4GHz. most routers have both 2.4 & 5 bands.
For such unique problems, better to approach a local professional, AFAIK they don't charge much, but looks like you don't need them in this case anyway
