Every second will be valueable if you can perfectly use it. It seems you are afraid if you coin get dumped after buying because bear is still on its way! but honestly nobody can accurately predict what will happen tomorrow. So you should rather divided your fund and invest with potential coin like btc, eth, xrp, bnb. If those get dumped then buy again and minimum the loss. Or you can wait. Potential coins will always pump.
Diversify your portfolio, I think this strategy is good for reducing investment risk,
all the coins that you mentioned are very worth buying and there is no need to hesitate,
take advantage of the opportunities that exist to make a profit.
Just do your homework in reviewing each project and then decide if how much portion of your investment you are willing to risk.
Diversifying is a good option since there are many available good assets to invest out, it's just
needed to sort it and review details about the full potentials before you dive in
and use your hard earned money, more on the knowledge and trust that you have when placing
your money into your investment.