Well the account you’re currently on indicates that you have a lot of improvement to develop in your gameplay before you can rank up.
If you buy a new account and play the same way you have been (for however long you’ve had this account), I would expect you to fall back to the same rank.
As you climb on tank, you’re expected to initiate more team fights and hold point so your team doesn’t have to. I (a DPS player) shouldn’t have to step on point in Sanctum to contest the Reinhardt.
If you climb on DPS, you’re expected to improve at positioning around your team and killing the targets focused by your tanks as well as finishing your own engagements and peeling for your back line. I’d strive for 10,000-11,000 dmg/10 if you intend to climb here.
If you climb on support, your heals output needs to drastically increase to sustain your team during the heavy amounts of damage they will sustain. You’re also required to balance your heals output with your damage output. I’d strive for 10,000-11,000 Heals/10 if you really wanna climb here