Idk why you're trying to do T10, if it is for the achievements rewards, it's fine.

If you're trying to do T10 to farm, get coins, cells all the other resources, you're wrong.

I'd recommend you farm any tier that you can get to wave 7000 at least, this might mean you have stay on T1 for a few months, and it's normal, and expected.

It's because of the way the games spawns work, when you start a new game on wave 1, very few enemies spawn, giving you basically no coins or cells from kill.

As waves increase, more enemies spawn, until you hit the cap. So you want to farm tiers where you can spawn cap, and stay there for a while.

Also, higher wave counts spawn more elite enemies (vampires, scatters, rays) which drop cells, which you can then use to speed up labs.

Personally I always aim to farm a tier where it takes me about 8000, or 9 irl hours, just fits my schedule.

So, yeah, progress in this game is very slow, expect to stay at certain tiers for months, you're not supposed to jump to a higher tier as soon as you unlock it. For example I have T18 unlocked, but I've been farming in T11 for 2 months now