Quickest & best way to increase seller limits

[StealthHarry]

What’s the quickest & best way to organically increase selling limits on personal eBay accounts?

From my knowledge I’ve tried in the past a fast selling line £15 x 60 sales in a month

This increased the limit on a personal stealth account from £3500 / month to £17k / month

I don’t think this was fluke, but I did not receive a email about the limit increase it just happened showed on limits as £17k

Any useful information would be greatly appreciated

Thank you & good luck to all