Currently, the USDT price is 6.9. You can buy in large quantities at 6.5. $ETH

In a bear market, USDT price will be cheaper. For Ethereum, you can allocate your positions as follows: 40% at 800, 30% at 1300, 20% at 1800, and 10% at 2100.
If you have 100,000 USDT,
your average price would be 800×0.4+1300×0.3+1800×0.2+2100×0.1=1280 average price.
When the bull market arrives, you'll get a great result.
Of course, if you have extra USDT, you can gradually invest some into altcoins.
It is recommended to allocate only 20% of your total position to altcoins.