Grid trading: just lucky or I have something here?

Have been doing grid trading on BTCUSDT futures for a month and consistently doing $100+ per day on average (my target). Started with $5000 (using $4000 for the grid at first and leaving $1000 for safety as I was worried about liquidation) and have made $4000 this month reaching $9000 which I plan to keep reinvesting. Started more leveraged like 40x, then as I reinvested the profit I have been lowering leverage to 30x then 20x while keeping my target of $100+/day average which feels comfortable now.

Doing mostly neutral strategy, sometimes I did long or short strategy when I thought the market would go that direction but I have to say I definitely got lucky on those (or rather not unlucky to lose), but decided to only do neutral after some time for less stress and it has been very steady and "chill".

I mostly use the grid range suggestion from the exchange's AI and just let the grid do its thing for as long as needed until I reach the $100+/day average target, then I close it and make a new grid readjusted to the current market position. I generally reach the $100/day target within 1 or 2 days but sometimes I did have to keep de grid for 9+ days with half of them in the negative, so sometimes it requires patience seeing negative until the market reverts. I do set automatic exit strategies (both TP and SL) way before liquidation but never had them triggered so far. If I see there is a clear dip or rally I stop operating for some time until I see a sideways trend again.

Am I just fooling myself with this and it has been mostly luck and I'm one big swing away of getting wiped, or do I have some kind of decent long term working strategy here? Seems too good to be true which scares me.