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What's the reason for wanting to upgrade? Are you struggling for some reason? What games? What monitor?

Just got the upgrade itch and like a good deal when I see one seeing how the prices have been of late.
I have the 1060 mini 6gb Zotac, and my monitor is the aoc g2790px (free sync I know) but often switch to game on my tv with is 55” at 4K on the games I can.
Games I play are wildlands, pcars 2, middle earth, division,f1 2017,rise of the tomb raider and just started the Witcher 3. Looking forward to f1 2018, hitman 2 and shadow of the tomb raider!
I wouldn’t mind waiting for next gen but how long does one wait?
Been keeping an eye out the last few months but still nothing
The only weirdness is having an Nvidia GPU and a FreeSync monitor.
Get a laptop stand with fans on, seems to work good, my laptop runs about 70-90 depending on the games, runs everything at 4K like.
Not really.
I actually somewhat object to the word "bottleneck". A bottleneck implies that there is a part of your system that will inhibit further improvement if you buy a new GPU, and this certainly is not the case. Either improving the CPU or the GPU will result in gains. I prefer the word imbalanced in that it is obvious that if your CPU is completely useless that you may suffer problems in games due to that alone, problems buying a new GPU will not resolve. The 7500 is a good CPU, and you will definitely see an improvement with both the 1070 or a 1080. Personally I think that adding a 1070 or 1080 to your system are both perfectly valid improvements and well worth the money. Having said that, I wouldn't go any further without upgrading the CPU.
I have one PC that has a 1070 in it and it runs 4K just fine. Sure, some games you have to step the quality down a bit, but as long as you are not too demanding then it's fine. It runs most games on a 4K TV at a rock solid 60fps. It does leave something to be desired but there is always the 1080.
The next gen, well, it's not long now, but realistically I think it will be Christmas before there are cards in numbers in the shops. And don't forget that 1080's are going cheap ( if you can call that cheap ) because everyone is waiting for the 1180's. When the 1180's appear they are going to be similar prices to a 1080ti.
I think if a 1070/1080 can play absolutely anything you throw at it and at 60fps 4K how much more is a 1180 going to do to the eye!?
You definitely got it wrong if you think a gtx 1070 is going to play anything you throw at it at 4k 60fps.
You can play at 4k on a 1070/1080 but you are going to be dropping below 60fps and going to be turning settings down.
Take wildlands for example the game you first mentioned at 4k you looking around 25fps with setting tunred up.
If ya playing at 4k I would just wait for next gen.