Im currently only using a 1080p 144Hz monitor and don't plan on upgrading as i only play competitive FPS games. Is it worth the upgrade for games like CSGO/Valorant?
With the prices increasing, I'm not sure if it's a good time to upgrade. I have a 1000 series as well and it's faring well despite some high temps here and there and the inability to have 120 fps in more recent, demanding games. But it does it's job really well I'd say.
Probably not the best moment for gpu upgrade. The costs are high, there's not many and you should probably look for a cpu, not a gpu. This is because a gpu wouldn't really affect the gameplay noticeably.
IF you only play those games and you get 144fps, buying a 3070 is throwing money out the window, especially in this climate where the prices are obscene.
If you're playing just those games you shouldn't have any issues for the next decade on a 1070. 3070 would be for whatever is coming out this year and for the next 4/5 years. If youre experiencing performance issues that are causing stuttering you might wanna check your CPU or your drivers.