● Check the marketcap first before you invest for bitcoin
NO need to check the marketcap of bitcoin since it has the highest marketcap of cryptocurrency, and bitcoin is king while altcoins are duplicate of bitcoin. This your statement is used for altcoins not for bitcoin.
● lnvest when you know is on the bearish season
It is not a good idea to invest only in the bear season, because how long will you keep waiting for the bear market to come when we know that four years make a circle in bitcoin movement. It is better to invest whenever you have the money to buy, just buy more either in the bear or bull. It is only if you are a trader or short term hodler that buying at the bear alone is good. But if you are a long term holder, and you just started your bitcoin accumulation journey, it is good you figure out an amount that you can use to buy bitcoin regularly weekly or monthly. Beginners should not think of trading. Also a long term hodler that have reach or close to his bitcoin target, can buy only at the bear market.
● Make a proper research before you invest bitcoin
This is for altcoins and not bitcoin. It has been proven that bitcoin is an asset that will survive in future, and this is why we are having the lunching of bitcoin ETF in countries.
● Don't be greedy after you have make at least 5x to 10x for your investment
Also an altcoin guidelines, and trading guidelines not to run at loss. Sound like gambling to me.
● Diversify your portfolio for altcoins investment
There is no need to diversify into an i9of the same line, since you are into bitcoin, if you must diversify because you want your funds in various assets and not only bitcoin, it is good you diversify into assets like gold, real estate, stock or cash equivalent. So that when one is not doing well, the other can cover for it.