Bear with me for last question. Given that i have this change, how to create another tx that will bump my previous tx? Don't mind the amounts im spending, that it'll be too low. I want to know how to do it.
In your Electrum wallet, right click on the "Coins" tab (you may have to click on View -> Show Coins first), right click on your change output, and click spend. Then click on the "Send" tab, enter another address you own in the "Pay to" tab, click on "Max", click on "Pay", and select the highest fee you can.
Tommorow i'll have few more bucks in my account but it would appear in my legacy address, but maybe i can reroute that.
The best thing to do would be to export the private key of your change address and the private key of the legacy address which is receiving the new coins tomorrow, import both in to a new wallet together, and then spend them both in the same transaction.