5. Avoid listening and reading wrong informations from Bitcoin haters.
In addition to all that has been mentioned by OP, you should also be positive about your investment yielding good profit someday. Don't panic if the price dumps because it will pump again. Also be positive that you will grow in the forum and give yourself more time to learn and make research on your own. Bitcoin investment is like a new born child that takes time before he/she becomes a toddler. Having the market analysis knowledge will keep you stronger to hold for long.
That is if OP doesn't buy at ATH, if you buy altcoins at ATH you are in deep trouble already, because many altcoins won't ever see their ATH of the past again, so you will lose a lot of money, but judging from past bear market, almost all coins and tokens surge in price, even the worst projects still do up to 200% and more, it's like a bonanza period where both good projects and shit projects will bring profits to all investors.
Avoid buying at a high price or ATH, always risk your money when dips or corrections happens, and it won't stay in the dips for a long time, so there is no way you won't make some money.
I prefer you hold long term also, because some people are always in haste to make money and they sell too soon when they see 3x gains and instead of buying back at a lower price they walk away and later the price surge even higher, some take profits hoping for some corrections and it never happen, this is why knowing how to read charts is good.