Invest in DeFI, Or literally any good project. You'll never make your 6K back in time if you're just starting now. GPU, PSU, and other Hardware prices are through the roof. During Bullmarkets you DO NOT BUILD mining rigs. You buy the coin which will make you'll more money in a month than a mining rig will paying itself back. That's my personal opinion. I'm a big miner, but I started during the first bullmarket in 2017 and never stopped even during the bear market of 2018-20.
With ETH finally getting Phase 0 and moving to phase 1.5 in 2021/22 Personally the mining game's over now. On top of that ASIC on ETH that are insanely powerful are coming online this year.
I regretted not building a good mining rig in 2017 even after bear market started, I knew someone who build is at the time and he kept gathering the Ethereum in his wallet, today he is a big boss in mining and he owns many more rigs now, the fact is continue mining even in bear season because no season lasts forever
@ op this is solid advice mining coins is like the tide it comes in and goes out.