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 mine coins for profits and for the fun of it, now it's more than a hobby, it's still a good time to buy graphics card and mine if you can get at fair enough price target, my own target is 100 days of mining at this profit season and if bear market comes after I know that have already make back most of my invested cash back, the rest will be on fun mode hehehe