I prefer to have the initial plan, because when you can buy every week regardless of price then I think buying every time there is a decrease will probably be the right choice. Anyway, in the end it's about holding right? So, if you have the ability to buy every time there is a decrease, then of course the purchases made at that time will get more assets than you bought when the price was still high.
Well, at the point where you feel your assets are already very high and are worried about being hacked then of course, at that point a hardware wallet will be needed. But yes, during that time I think you will be able to feel more comfortable if you continue to use the same wallet that was used before, because it will arise because you are used to it and feel comfortable if you continue.

Plan B is better but I have to replace LTC with BNB. I was considering more potentials that BNB has than LTC and we are talking about long-term goals which appropriately these coins meant to be.

60% on Bitcoin, 20% each for ETH and BNB. It will be good for me and I usually put more funds in Bitcoin coz I know the capabilities it has and we never regret it.

If I have to choose between Plan 1 or Plan 2, I prefer Plan 1 because for now only Bitcoin and Ethereum are good for HODL. But maybe
the percentage of investing in Bitcoin is slightly increased to 75% and investing in Ethereum is just 25%. That way the planning looks
more perfect. Regarding hardware wallets, it is really needed, because it is the safest crypto storage for now.

For me, its better to put our investment in different place of investment just like what the others say "don't put all eggs in one basket" because if you put it in one basket the risk is bigger and you cant easily manage the risk of investing in that way, thus  I choose the plan number two.

Your second plan look great and there are possibilities you can succeed.

Diversifying at the start is not a good thing for starters, there isn't any profit yet so you have to focus on one thing then try to grow your capital in it and then diversify. Personally, both plans don't seem viable to me because if you put all-in in bitcoin and it grows, you will get more value out of it and bitcoin proved that it can grow exponentially with the evidence that the charts from past months showing a growth. Timing the buys will be difficult but it is a must if OP plans to buy bitcoin at dips.

I think plan 1 is better than plan 2. Or you should only Invest in BTC at dip, so you can get big Profit. And I also suggest you to don't invest in LTC. BTC is good to invest.

Gonna give you "Plan 3", how about you keep buy btc every week and forgot about another coins?

For me BTC is the best and the safest investment you can do, Low Risk and High Gain = BTC.

If you dare to take the risk maybe you can find small coins(Outside top 200 CMC) with big prospect and good team.

Plan 1 is a safe choice since you are only risking to buy on those dips and the chances of those dips recovering are high which means the profits can come to you simultaneously on both Cryptocurrencies.

Plan 2 is much riskier but you should try and removing LTC since the volatility of its value is much slower than BTC and ETH. You could also try looking for Alternate Cryptocurrencies that can yield a much greater price by buying them at their lowest values like their starting values. Plan 2 is also a better way to improve your investments on the Cryptocurrency industry since you are spending money on them weekly.

I'll obviously go with Plan 1 because I just hate having this losses that is avoidable.

Hardware wallet is good when you hold large amounts of cryptocurrencies and you are planning to hold it for long term.

If I were at your place, I would buy BTC and ETH 50% - 50% and buy it on regular intervals to average out the price.
I would store it in the hardware wallet if I were to hold it for the long term.