I guess there are services like Unchained or LEDN, or you can do P2P lending

You can do it P2P on hodlhodl, and you're looking at 15-42% APR and finding orders based on your size is a pain in the arse, but you do the math and decide on the exposure along with the fees involved in moving on-chain and then the cost to acquire stables again to pay off your loan

Also keeping aside capital if LTV dips, its a ballache

It's not easy street thats for sure, and honestly most people shouldn't be using leverage lol