I’ve really many equipment since I was mining ETH back in 2021 but when it changed from PoW to PoS I’m not sure about its profitability..I mean only 3% APR and much more money to invest now.
And i'm not aware of any coin which offer 150% APR by perform staking.
I believe I saw new projects who gives that like ETH in the beginning
Assuming you remember it correctly, such APR probably only offered for very limited quantity or duration. And if you'd rather buy and stake altcoin, you might want to visit
https://www.stakingrewards.com/assets which shows APY of such altcoins.
Without any detail, no one can make solid recommendation. But if you don't have way to obtain Bitcoin ASIC affordably or cheap electricity price ($0.07/kWh or lower), BTC mining probably would be unprofitable for you.
Make it 5 cents or lower, 7 cents before taxes and other costs is a no-go, even with the s21 launched 6 months ago you're looking at 3 years' ROI.
You're right. I'm not mining, so i don't always remember the suitable electricity price.