i dont know what can we do to convince miners to start activating it.
If you feel strongly about SegWit, then you can purchase mining equipment and point it towards mining pools that support SegWit activation (or you could solomine with your blocks indicating support for SegWit activation)
You could also "rent" hashpower and point said rented hashpower towards the above type of pools.
Im just another broke guy going from month to month, I get enough to pay bills and that's about it, im afraid I can't do shit nothing in the mining circuit, I would have 0 impact and I would be running out of money at the end of the month since I would be investing it on that (on something that is giving me 0 returns). Doesn't seem realistic to me. Im trapped on this bill to bill lifestyle, I can't do nothing for bitcoin other than run a node on my computer, unfortunately.