One month ago I was stuck in bronze 3

Not that far if your recent Velkoz games are due to improvement rather then RNG synergy. Looks like its from improvement at least. Stat wise your recent history's noticeably better then your overall avrages.

Personally I expect you to be able to play at a silver 2-Gold 4 range, So you should end up in Silver 1. If you keep the recent history of wins up then when you do hit that S1 ranking I believe that your MMR should be gold 4 so your MM range would be roughly Silver 1 - gold 3 give or take an extra division due to population size.

If you can hit that, then even a 50% WR will net you gold. Not all that far, especially cuz you seem to have a Low K from high # of games so a bad day or two of MM due to asshole players wont generate a dramatic loss in MMR gains.

Just stay calm, focus only on your play and keep doing what works for you. Shouldn't take ya more then 3 weeks to make gold if all goes well. Update me if you make it in-between that time period.

Not unachievable though!