Buy a little bit of bitcoin every week don't care if it's a $1, $5, $10, $100,
It is not profitable to buy bitcoin for $1, because the relationship with the transaction commission will be more unprofitable than when buying for $100. Don't forget that the cost of the commission will be built into the purchase price and the burden will fall on the buyer's pocket.
With numbers like $1, $5, $10, I think you should save up and make a purchase once a month.
figure out what you can afford every week and buy it, get rid of unnecessary expenses or whatever you can think of getting rid of and spend it on bitcoin
It’s hard to imagine what expenses you want to get rid of if you’re going to buy bitcoin for $1 or $5.
5 to 10 years if you buy some every week you will be a multi millionaire
You are seriously overestimating and greatly mistaken if you expect to become a multi-millionaire this way.
By the way, but you, however, are a modest person, saying so
"Best piece of advice to anyone going into bitcoin".
It would be nice if you could share your personal experience of investing in bitcoin, if you allow me to give such advice.