Unless you have a ridiculously large income-in-fiat, so that pretty much "forever" you are always expecting to have excess fiat to toss into investments, seriously consider heading toward everything you have in crypto being all pure profit, every penny of fiat you ever put into it already long ago taken back out plus fiat profit.
If you can reach that point, which possibly or even likely is not as fast and easy as it was back when there were only 30+ cryptos in existence or even once there were 300+ or even by the time there were over 3000, then you can hopefully stop being so focussed on fiat at all and concentrate on growing your existing bags of crypto ever bigger.
At some point your crypto income will grow to rival your fiat income and unless your fiat income really is pretty darn impressive will probably outgrow it.
If you trade pairs of which bitcoin is one side of the pair you can grow your bitcoin holdings even while bitcoin trends ever upwards long term.
When your columns of buy-side offers, your heaps of offers to buy stuff with bitcoins, builds stronger and deeper than might actually be needed to catch even the most extraordinary dumps, you can thin out that buy-side a little to sell some of the bitcoin for fiat, that is a pretty good way of taking home some fiat from time to time.
You might be surprised how soon you will be weaned of fiat-focus and start living the life of a crypto-based person.
-MarkM-