-Waiting for an early crash and go all in on the next round: Basically, I would wait for several rounds until the multiplier crashed on x1.01, and then gamble heavily on the next one, believing there would be a "balance" which I could take advantage of. In the end, it would be just a faster way to lose money.
This is probably one of the most common things among gamblers. I have done it myself plenty of times when I still had some balance left. I waited for a few low multipliers and then placed one bet hoping to catch at least a 2x. Sadly, this kind of thinking is really bad and most of the time it just does not work.

A lot of people think that after several low multipliers, a higher one like 1.5x or 2x is due to appear, but nothing is guaranteed. Crash games are purely luck based, and that is why I rarely play them anymore.
Well. It makes me feel a little better to know I am not the only person who thought it could be doable, to fool the random number generator of the casino.
Usually, gamblers believe on the existence of disbalances on casino games. Like for example, when roulettes give red several times in a row and people decide to bet on black, believing their chances to score a win get higher when which red result it is drawn out the roulette.