Most People I have seen who are into landed property investment only sell land to buy another land at cheaper prices, meaning you can only sell your Bitcoin to Buy more Bitcoin, selling some portion at the top to buy back the dips.
Land is an asset but you don't treat bitcoin the same way that you treat a land. Bitcoin has given us the opportunity to buy with a little amount and you don't need big funds to start your bitcoin investment provided that you have a discretionary income even as low as $10 or $20, you can invest in bitcoin. This is why when you are investing this amount every week from your discretionary income regularly in order for you to be able to be increasing your bitcoin portfolio overtime.
Bitcoin investment is for the future, is just like you are saving 10% of your income in the bank so that you can have a huge amount of money at old age when you can use it to back up your financial life when you are old. This is how you should treat your bitcoin investment, you only add and not take so that you can reach your bitcoin target by staying focus on building and growing your portfolio.
A new investor shouldn't think about profit since he just started his bitcoin investment journey so that he does not make the wrong choice but rather see bitcoin as a means of saving his funds because it is an investment that give you good profit in the long term, since bitcoin price has the high odds of an uptrend movement than downtrend movement since it is in its maturing state.
No matter how smart you think you are in buying low and sell high believing to buy back at low price, you are a trader and you are not exceptional from the consequences of trading. Bitcoin is worth more than land, and so treat your bitcoin investment like something that's not worth selling and precious to you so that you can reach your bitcoin target with dedication and all seriousness by keeping your bitcoin accumulation ongoing, rather than slowing it down when you sell to buy back because that's a dangerous approach for a long-term investor.
You are right that land is bought outright and in bulk and held permanently. But Bitcoin is different in that it can be bought in small amounts. Anyone can buy it for $10-$12 per week or less if they want. Trading also requires large funds, but you don't need large funds in the only system that Bitcoin has. We can increase investment by investing less. If we have a job or business, save something from it for old age. In the same way we can accumulate Bitcoins. This can give us a good amount of profit over time. We will put aside the thought of profit first and use it first to preserve the purchasing power of money. Basically we use bitcoins for storage and not for sale. It can be risky if we trade repeatedly. It would be wise to maintain a little consistency.
In short, you have to plan to hold for the long term by excluding the thought of buying low and selling high. And if you proceed with patience and planning in this way, it will play a helpful role in achieving the goal.